An Unexpected Arrival
The silence in the bustling commercial district of Crocus lasted approximately three seconds after Kai's sudden, unannounced appearance.
Standing right in the middle of their little group, casually sipping from a pastel-coloured fruit juice box, Kai didn't look like a man who had just slipped through the shadows and bypassed the instincts of half a dozen elite Royal Guards.
He looked thirsty.
Then reality caught up with everyone.
"GAAAAH!"
The reaction was immediate and spectacularly chaotic.
Cana executed an impressive backward leap, three explosive cards snapping into existence between her fingers. Captain Arcadios reacted on instinct, his hand flying to his broadsword as six inches of gleaming steel emerged from its scabbard with a metallic shriek.
Juvia wasn't far behind. Both arms shot upward, and a spinning vortex of pressurised water manifested above her head, its rushing roar momentarily drowning out the surrounding street.
Even Princess Hisui, who had spent the past several days enjoying a welcome reprieve from royal formalities, abandoned every trace of her composure. A startled squeak escaped her lips as she nearly jumped out of her custom silk slippers.
Only Mirajane remained relatively composed.
She blinked twice, took in the scene, and then allowed her familiar, radiant smile to settle over her features.
Kai's golden eyes travelled lazily from Arcadios's drawn blade to Cana's hovering cards, finally settling on the small localized typhoon surrounding Juvia.
He took one last, noisy sip.
The bottom of the juice box collapsed with a soft crinkle.
"...Well," he drawled, lowering the empty container. "That's welcoming. Did someone officially declare a national 'Stab the Research Director' day, or am I just special?"
"WHERE IN GOD'S NAME DID YOU COME FROM?!" Cana barked.
Her cheeks had already begun turning red as she hurriedly slipped her cards back into their pouch.
"You don't just appear out of thin air while people are talking!"
"Actually, shadow-stepping is quite literally defined by appearing where people don't expect you to be," Kai replied smoothly. "Though I suppose I could start announcing myself with a trumpet."
Arcadios was the first to recover.
"Since when have you been standing there?"
Kai glanced at the group, then down at the empty juice box in his hand.
He took a moment to consider the question.
"Around the time Juvia started planning matching velvet travel cloaks and a seven-course lunchbox for our romantic theatre date in Onibus."
He folded the empty juice box between his fingers.
"Quite the elaborate plan, actually."
The temperature of the surrounding street seemed to rise by several degrees.
Juvia went rigid.
An audible hiss escaped her as steam erupted from her ears. Her face turned such a spectacular shade of crimson that even Erza might have struggled to compete.
Her water vortex dissolved into harmless droplets, thoroughly soaking Arcadios's iron pauldrons in the process.
"K-KAI-SAMA!"
Juvia's hands flew to her burning cheeks.
"You... you heard that?! You heard all of that?!"
"Loud and clear, rain-girl."
Kai scratched the back of his neck, a mischievous smirk playing across his lips.
"Honestly, matching velvet cloaks sound a little heavy for the season, but I respect the commitment to the aesthetic."
"I-I... Juvia... that is..."
The water mage began vibrating in place, apparently reconsidering whether transforming completely into water and disappearing down the nearest drain was a viable option.
Cana crossed her arms, attempting to recover some semblance of dignity.
"Hey, don't look at me like that, slacker! I was just giving the girl some tactical romantic advice. It's not my fault you have the auditory range of a bat."
"Advice implies wisdom, Brownie."
Kai stepped past her, unfolding the theatre flyer.
"What you were doing sounds suspiciously like organizing an unauthorized kidnapping."
Hisui giggled behind her hand.
"He does have a point, Cana. You were being rather dramatic."
"Traitor," Cana muttered.
Despite herself, the corner of her mouth twitched.
Mira, meanwhile, had taken a step closer to Kai. Her expression was warm, but her eyes briefly travelled over his face, checking for any signs of injury.
"You look much better, Kai. I take it your little technical discussion finished without any further property damage?"
"The forest is intact."
He paused.
"Mostly."
Mira gave him a knowing look.
Kai simply smiled.
Arcadios finally pushed his broadsword back into its scabbard with a heavy clack. His scarred face remained set in a deep, suspicious frown.
"Director Sunveil."
He stepped forward.
"Where is the unregistered swordsman? The wanderer who identified himself as Rei?"
Kai waved a dismissive hand.
"Relax, Captain Hook. He's already left the district. Probably halfway out of the regional territory by now."
Arcadios's expression darkened.
"You allowed him to depart? Without official clearance or military documentation? He engaged you in combat within the capital's vicinity!"
"We reached a mutual understanding."
Kai leaned his hip against a nearby stone lamp post.
"It's an independent research agreement. Mutual assistance, access to ancient archaeological records, historical preservation rights for him, and primary hardware research rights for me. Standard scholarly exchange."
"He is an unvetted combatant carrying a high-grade weapon!" Arcadios retorted. "Can you guarantee that he will not cause unauthorized trouble within the Kingdom's borders?"
Kai tilted his head.
For a moment, he regarded the Captain with an expression of complete sincerity.
"Guarantee that he won't cause unauthorized trouble?"
"Precisely."
"Absolutely. I explicitly informed him that if he's going to blow up an ancient vault or accidentally cause an international incident, he has to run the paperwork through me first."
Arcadios stared.
"That is not what I—"
"Think of me as his administrative supervisor."
"Director!"
Kai chuckled.
Mira, who had been listening quietly, finally spoke.
"So he's a research associate now?"
"More like an independent contractor," Kai corrected. "He stays out of the Council's hair, digs up four-hundred-year-old dirt, and contacts me through a private frequency if he finds any interesting hardware I might want to dismantle."
He shrugged.
"Clean, efficient, and absolutely zero bureaucratic overhead."
Cana snorted.
"Translation: you found yourself another nerd to help you dig through trash."
"It's high-grade historical trash, thank you very much."
Kai gave her a wounded look.
Hisui stepped forward, clasping her hands behind her back.
"So... what about the theatre performance, Kai? Are you coming to Onibus with us?"
The question settled over the group.
Juvia peeked out from between her fingers, her blue eyes carrying a small but unmistakable glimmer of hope. Mira and Cana watched him with quiet interest, while even Arcadios appeared vaguely invested.
Kai scratched behind his ear, his gaze drifting towards the bright afternoon sky.
"Well..."
He considered the offer.
"Watching Erza attempt to deliver dramatic dialogue without accidentally destroying the stage props does sound entertaining."
Cana laughed.
"But I've got a couple of research projects I need to clear out of my laboratory first."
Juvia's shoulders slumped.
A tiny storm cloud appeared above her head.
"Kai-sama has to work...?"
"Don't look so crushed, rain-girl."
Kai reached out and lightly tapped her forehead with two fingers.
"I didn't say no. I'm finishing some structural mapping on elemental body transitions, specifically how your water transformation operates without destabilizing your ethernano. There's also a new diagnostic spell I need to construct."
He raised five fingers.
"Give me five days in the lab. I'll give you a definite answer before the weekend."
Mira smiled.
"Five days sounds perfectly reasonable. Besides, that gives us plenty of time to explore Crocus while you're buried under your blueprints."
"Just don't let them spend the entire Ministry budget on pastries, Princess."
Kai gently nudged Hisui's shoulder.
"I have my own royal allowance!" Hisui protested. "And I intend to buy enough honey-cakes to fill an entire carriage!"
"Of course you do."
Kai shook his head.
Something told him that his expenses for the coming week were about to increase considerably.
The Laboratory: Elemental Physics
The lower levels of the Ministry of Magic's research facility were quiet.
Floating lacrima lanterns illuminated the polished stone walls, while the low, rhythmic hum of active runic arrays provided a constant background to the otherwise silent corridors.
The primary laboratory was a different matter.
Its central chamber housed an assortment of observation platforms, diagnostic equipment, enchanted instruments and several experimental constructs that would have looked more at home in an ancient wizard's workshop than a government research facility.
At the centre of it all, Kai stood before a massive glass observation panel.
A sleek stylus hovered between his fingers as translucent golden spell matrices unfolded in the air around him.
Ten paces away, Juvia stood on a raised stone platform.
"Alright, Juvia."
Kai's voice had settled into the crisp, analytical tone he reserved for active field testing.
"Standard physical-to-elemental transition. No combat intent. Start with your right forearm and gradually extend the transformation towards your shoulder. Don't rush it. I want to observe the transition rather than the final state."
"Yes, Kai-sama!"
Juvia straightened enthusiastically.
She closed her eyes and took a steady breath.
A fraction of a second later, her right arm ceased to be flesh and bone.
There was no violent flash or elaborate magical display. Her forearm simply liquefied, becoming a clear, pressurised column of swirling water that maintained its shape through the continuous manipulation of her magic.
Kai's golden eyes sharpened.
He wasn't merely watching her.
His perception, refined through years of martial training and the integrated Kaldor runic matrix within his body, tracked the minute fluctuations in the ethernano surrounding her transformed limb.
His stylus began moving rapidly across the observation panel.
Interesting.
His attention narrowed.
There's practically no transitional delay.
Most elemental mages relied on external generation or elemental reinforcement. Their bodies remained fundamentally physical while their magic produced and controlled an element around them.
Juvia's magic was considerably different.
Her transformation was intrinsic to her magical constitution.
Rather than producing water and controlling it externally, she could convert her own physical form into her element while maintaining her consciousness and magical structure.
There was no visible separation between the transformation and the continued existence of her body.
She's not creating a temporary elemental construct. She's maintaining herself through a continuous elemental state.
"Again," Kai instructed.
Juvia glanced at him.
"This time, reverse the process. Begin restoring your physical form, but interrupt the transition halfway through. Hold it there for three seconds."
"Understood!"
The water surrounding her forearm began to condense.
Gradually, its surface changed. Skin, muscle and bone reformed from the swirling liquid, the transition occurring with an almost unnatural smoothness.
Then Juvia stopped.
Half her forearm remained water while the other half had returned to its ordinary physical state.
Kai approached the platform.
His fingers hovered just above the boundary where liquid water met human skin.
"The boundary isn't rigid..."
He examined the transition closely.
His mind had already begun connecting the observation to an entirely different branch of his own magic.
My shadow techniques rely on changing the relationship between my physical body and the shadow plane.
I can sink into an existing shadow, travel through connected shadows, or partially transition my body into that dimension. But the transition isn't entirely instantaneous.
There was always a minute adjustment when returning to physical space.
A brief moment in which his body had to re-establish its physical presence.
It was barely noticeable to an ordinary observer, but at his level, even the smallest delay could matter.
Juvia doesn't seem to have that problem.
Her transformation maintained continuity throughout the process. There was no obvious interruption between one state and the other.
What if I can apply the same principle to my shadow transitions?
Not by copying her elemental magic, but by studying the underlying mechanics of continuous transformation.
He could potentially reduce the resistance between his physical and shadow states, making his movements considerably smoother.
"Is Juvia's magic helping Kai-sama?"
Her voice brought him back to the present.
Juvia was looking down at him, her cheeks carrying a faint pink hue.
Kai stepped back, examining the final readings on his observation panel.
"More than you know."
He smiled.
"You don't just change state, Juvia. Your ethernano maintains a continuous relationship between your physical form and the surrounding moisture. It allows you to transition without the usual structural instability."
He tapped the glass.
"That's brilliant engineering, even if you're doing it entirely through instinct."
Juvia's eyes sparkled.
"Kai-sama called Juvia's magic brilliant engineering..."
Her hands flew to her cheeks.
"This means our souls are structurally aligned! It is destiny written in the stars!"
Kai stared at her for a moment.
Then he laughed.
"Let's not rewrite astronomy just yet, rain-girl."
He turned towards the nearby control console.
"Take a ten-minute break. We'll test rapid-phase displacement next."
"Yes, Kai-sama!"
Juvia practically glowed.
For her, the laboratory session had been considerably more productive than she could have imagined.
For Kai, it had opened an entirely new avenue of research.
Echoes in the Dark
Later that evening, the heavy oak doors of the laboratory creaked open.
A familiar silhouette appeared in the doorway.
Mirajane walked inside carrying a small silver tray. A steaming teapot and two porcelain cups rested neatly upon it.
She paused briefly, taking in the familiar chaos.
Towering chalkboards were covered in mathematical equations. Floating lacrima projections displayed half-completed magical structures, while several mechanical components lay scattered across the workbenches.
In the middle of it all, Kai was examining a small metallic device beneath a brass magnifying glass.
"I thought I might find you still awake."
Mira's voice carried its usual warmth.
"You've been down here for six hours, Kai."
"Have I?"
He lowered the magnifying glass.
"Time flies when you're trying to rewrite fundamental physics, Clouds."
Mira smiled and placed the tray on an empty section of the workbench.
"Drink. You look like you're about to fall asleep standing up."
Kai accepted the cup.
"You're a lifesaver. As usual."
He took a sip, allowing the warmth to settle before releasing a contented sigh.
Mira leaned against the desk beside him.
For a while, neither spoke.
The laboratory was peaceful at this hour. The distant hum of the magical arrays and the occasional flicker of the lacrima lanterns were the only sounds accompanying them.
"So..."
Mira glanced towards him.
"Juvia seemed very happy when she came upstairs earlier. She spent nearly twenty minutes telling Cana about how you studied her water transformation."
Kai chuckled.
"She's a fascinating subject. Her continuous fluid transition might help me optimize my shadow-stepping techniques. If I can adapt the underlying principles, I could potentially reduce the resistance when transitioning between physical space and the shadow plane."
"That sounds rather complicated."
"It is. That's why I get paid."
Mira laughed softly.
Then her attention drifted towards her lap.
Her fingers had settled around her left wrist, idly tracing the edge of her sleeve.
Kai noticed almost immediately.
His expression softened.
"You've been thinking about it, haven't you?"
Mira blinked.
For a moment, she looked surprised.
Then a small, slightly sheepish smile appeared.
"Is it that obvious?"
"Clouds, I've known you since we were kids."
Kai set his teacup down.
"You only hold your left wrist like that when you're processing something heavy."
Mira let out a quiet breath, somewhere between a laugh and a sigh.
She unclipped the dark wooden flute from her waist.
Lullaby.
Its surface was smooth and dark, with intricate runic engravings carved along its length. Despite its unassuming appearance, the instrument contained a magical architecture that had once belonged to one of Zeref's most dangerous creations.
"It feels strange," Mira admitted.
Her thumb brushed against the flute's polished surface.
"I spent so long believing that Take Over magic was dangerous. That absorbing demonic entities was something that could only bring pain."
Her voice grew quieter.
"And after what happened with Lisanna... when I was too weak, and my own arrogance cost us everything..."
She paused.
"I couldn't bring myself to use it anymore. I couldn't even stand the thought of channeling a demon's ethernano."
Her fingers tightened slightly around the instrument.
"Especially after years of disuse. Then there were incidents like Phantom Lord, when I watched everyone fighting and realized how helpless I had become."
She looked down.
"I want to be able to help again, Kai. I want to protect our family. But..."
Her expression faltered.
"I still can't access my magic."
Kai didn't interrupt.
He simply listened.
Mira continued, her attention returning to the flute.
"But when I played this earlier, I could feel it."
Her blue eyes narrowed thoughtfully.
"Even though you removed its soul-consuming curse and completely rewired its channels into healing magic, the foundation underneath is still a Demon construct."
She swallowed.
"It's still Zeref's magic. A demonic architecture."
"It is."
Kai nodded.
"I rewired the circuit board. I didn't change the wood it was built from."
Mira gave a small laugh.
Then she looked up at him.
"When you told me to keep it... were you already expecting this?"
Kai glanced at the flute before returning his attention to her.
"Not exactly. I knew there was a possibility, though."
He leaned back against the desk, folding his arms.
"You see, Mira, I've spent quite a bit of time studying Lullaby's structure. Even after removing the curse, its underlying magical architecture hasn't completely changed. It's still built around the same principles that govern Dark magic."
He tapped his chin.
"And that got me thinking about your Take Over."
"My Take Over?"
"Right."
Kai tilted his head.
"I think you've been looking at it the wrong way."
Mira watched him attentively.
"Take Over isn't simply about overpowering a demon until it submits and then stuffing its soul into your body. That's the brute-force approach."
He raised a finger.
"What you're actually capable of is something considerably more refined. True Take Over, particularly at a higher level, is about spatial and etheric resonance. It's about establishing compatibility between your own magical origin and the target's magical matrix."
He gestured towards the flute.
"Lullaby isn't an aggressive demon anymore. Its consciousness and curse have been removed, its channels are stabilized, and its magical structure is passive."
He paused.
"If you want to reconnect with your Take Over magic, you don't necessarily need to hunt down some wild monster in a dark forest and wrestle it into submission."
A small smirk appeared.
"You can start right here."
Mira looked down at the instrument.
"Establish a connection... with an artifact?"
"Why not?"
Kai shrugged.
"Spend time with it. Familiarize yourself with its magical signature. Feel its dark ethernano without trying to force control over it. Let your magic become accustomed to the sensation of an Etherious structure again."
He leaned forward slightly.
"Slowly. Carefully. On your own terms."
His voice softened.
"You don't have to force yourself to become the She-Devil again just because the guild needs another heavy hitter."
He met her eyes.
"But if you want to reclaim that part of yourself, Lullaby could serve as a bridge. A relatively safe one."
Mira went still.
For years, the absence of her Take Over magic had remained a quiet ache beneath her peaceful barmaid persona.
She had accepted her circumstances. She had found happiness in the guild, in her friends, and in the ordinary routines she had built for herself.
But deep down, a part of her had always felt incomplete.
She had once been strong.
She had once been fearless.
And somewhere along the way, she had convinced herself that those days were gone forever.
Kai wasn't telling her she needed to be fixed.
He wasn't demanding that she return to the battlefield or prove something to anyone.
He was simply offering her a door.
And allowing her to decide whether she wanted to open it.
A wave of emotion swelled in Mira's chest.
Before she could think better of it, she stepped forward and wrapped her arms around Kai's waist, burying her face against his chest.
Kai blinked.
The sudden embrace caught him off guard, if only for a moment.
Then his expression softened.
He placed one arm around her shoulders and rested his other hand gently against her back.
"Thank you, Kai."
Mira's voice was muffled against his shirt.
"You always... you always know exactly what I need."
"That's because I'm a genius, Clouds."
Kai's reply carried its usual playful confidence.
Mira giggled.
She remained there for several more seconds before eventually stepping back.
Her blue eyes were bright again, carrying a spark that had been absent for far too long.
She carefully tucked Lullaby back into her sash.
"I'll take it slow," she promised. "Step by step."
"Good."
Kai picked up his teacup.
"Because if you accidentally transform into a giant wooden flute-monster, I'm never going to let you live it down."
Mira burst into laughter.
A sound like clear bells echoed through the laboratory.
And for the first time in years, the thought of reclaiming her old magic didn't feel quite so frightening.
The Genesis of Scan and Archive
With his observations of Juvia's elemental transformation complete and Mira's concerns addressed, Kai finally turned his undivided attention towards the personal milestone he had been working towards all week.
Scan.
The diagnostic spell was intended to address one of the few persistent limitations in his otherwise extensive magical toolkit.
Kai sat at his central drafting station, surrounded by three-dimensional projections and floating technical diagrams.
His golden eyes followed a series of rotating mechanical components.
"The physical limitations are obvious."
He leaned back, tapping the stylus against his chin.
"My eyes are optimized for high-speed visual tracking, movement prediction and kinetic calculations. But when it comes to microscopic inscriptions, layered runic arrays hidden beneath physical surfaces, or unfamiliar ambient ethernano signatures..."
He sighed.
"I'm effectively blind in the field."
It was an irritating limitation.
His Tinkerer Arts allowed him to understand, dismantle and construct complex mechanisms, but that didn't mean he could instantly perceive every internal component of an unfamiliar object.
Sometimes, the only reliable method was to take something apart.
That was hardly practical during combat or field research.
He opened a new parchment and began listing the requirements.
Scan: Preliminary Operational Requirements
Passive and Active Structural Analysis: A non-destructive scanning field capable of examining physical composition and magical density.
Layered Array Mapping: The ability to penetrate subsurface materials, including metals, stone and lacrima, to identify internal structures and magical circuits without physically dismantling them.
Ethernano Signature Identification: Recognition and classification of unfamiliar magical signatures, with the ability to compare them against an existing database.
Information Processing and Storage: Real-time processing of collected information without overwhelming the user's cognitive capacity or causing magical feedback.
Kai stared at the fourth requirement.
For a long moment, he didn't move.
Then he dropped his head against the back of his chair.
"And that's the bottleneck."
He rubbed his temples.
"The analysis itself is easy enough. I can construct an optical projection matrix using Tinkerer Arts in twenty minutes."
He gestured towards the floating diagrams.
"But processing and storing all that raw information in real time?"
He shook his head.
"My brain isn't a computer. Dumping thousands of individual runic structures into my short-term memory during a fight is a wonderful way to give myself a headache. Or worse."
He needed an intermediary.
Something capable of receiving the raw data, organizing it, indexing the information and presenting the results in a usable format.
An external magical processing architecture.
An operating system, essentially.
Kai tapped his fingers against the desk.
I need something that can function as an extension of my own analytical capabilities.
His thoughts drifted towards the communication network he had developed previously.
Then towards the different magical disciplines he had studied during his years at the Ministry.
Suddenly, an idea occurred to him.
The next morning, Kai summoned Administrator Siris to his private office.
"Director."
Siris entered with his usual composed expression.
"You requested historical documentation from the Royal Vaults?"
"Not quite. I need every high-grade text currently available on information processing, external memory storage and optical analysis magic."
Kai leaned back in his leather chair.
"Specifically anything involving automated indexing, magical databases and information projection."
Siris nodded.
"Understood. I shall have the relevant archives retrieved."
Two hours later, he returned carrying a heavy leather-bound ledger.
Kai spent the entire afternoon going through its contents.
He examined historical spell diagrams, theoretical frameworks and the practical applications of various lost magical disciplines.
Thought Projection.
Too unstable for continuous raw-data processing.
Clairvoyance.
Too broad. It offered excellent observational capabilities but lacked the structural resolution he needed.
Memory-Make.
An interesting discipline, but its primary applications involved actively constructing and manipulating memories rather than passively receiving and indexing information.
He turned another page.
And stopped.
[ARCHIVE MAGIC]
An ancient, lost discipline capable of converting information into organized magical data structures. Primary applications include real-time information storage, optical projection displays, remote communication and rapid information transfer.
Kai stared at the entry.
His eyes travelled across the accompanying runic diagrams.
Then his expression changed.
A slow, brilliant grin spread across his face.
"Archive..."
He leaned closer.
"Of course."
He flipped back several pages, examining the diagrams more carefully.
"How did I skip over Archive?"
He remembered briefly considering the discipline two years earlier, when he had been developing his personal communication network.
At the time, however, integrating his existing magical systems had already consumed most of his available resources.
He had shelved the idea.
But now?
It was precisely what he needed.
Archive wasn't simply another information-storage spell.
Its underlying principles allowed the creation of a magical information environment, complete with organized data structures, virtual displays and rapid retrieval systems.
It could function as a magical operating system.
Scan would collect information.
Archive would receive it, organize it, process it and store it.
The resulting information could then be projected through an optical interface, allowing Kai to examine detailed three-dimensional schematics without personally processing every individual data point.
In other words, he could finally build a proper diagnostic system.
Kai straightened.
"STIFFY!"
The office door opened almost immediately.
"Yes, Director?"
"Requisition the complete foundational manuals for Archive Magic from the Royal Library. Every available volume. Theoretical texts, practical applications, historical documentation. I want the entire collection."
"At once, Director."
Kai picked up the ledger again.
His grin widened.
This was going to be fun.
A Week in the Capital
While Kai buried himself beneath mountains of magical theory, the rest of the group made excellent use of their time in Crocus.
The capital of Fiore was a city unlike any other.
Its grand avenues were lined with historic monuments, elaborate fountains and beautifully maintained gardens. Commercial districts stretched across several neighbourhoods, offering everything from imported delicacies and enchanted jewellery to rare magical instruments and luxurious clothing.
And with Princess Hisui serving as their official host, the Fairy Tail girls had access to practically everything the city had to offer.
Naturally, Kai's participation was considerably less consistent.
Tuesday
Mira eventually managed to convince him to take a three-hour break from the laboratory.
The two spent the afternoon strolling through one of Crocus's high-end artisan markets.
The streets were lined with colourful stalls and elegant storefronts, while merchants enthusiastically advertised their latest creations to passing customers.
Mira stopped in front of a jewellery display.
"What do you think of this one, Kai?"
She held up a sleek silver hairpin shaped like a delicate feather.
Kai leaned closer.
His golden eyes examined the metal.
"The silver alloy is decent, but the weight distribution is terrible. If you wear that on a particularly windy day, it's going to slide right out of your hair."
Mira stared at him.
Then she burst into laughter.
"I asked whether it looked pretty, Mr. Engineer, not whether it could survive a hurricane!"
"Then you should have asked that, Clouds."
Kai smirked.
Before she could respond, he reached for the hairpin, took it from her hands and paid the merchant.
Then, with a casualness that suggested he had done it a hundred times before, he stepped closer and gently slid it into her hair.
"Yeah. It looks pretty good on you."
Mira went quiet.
Her fingertips rose to touch the silver feather.
A faint blush appeared across her cheeks as she looked up at him.
Kai, apparently satisfied with his assessment, had already turned his attention towards the next shop.
Mira followed, her smile lingering.
Wednesday
Cana's turn arrived the following afternoon.
And, predictably, her destination was a tavern.
Not just any tavern, either.
She had chosen one of the most expensive establishments in the upper district, famous for its imported beverages, luxurious furnishings and rather impressive collection of enchanted barrels.
"Put it on the Director's tab!"
Cana announced cheerfully, slamming a massive wooden stein of imported dwarf ale onto the counter.
Kai, who had been examining the menu, slowly turned towards her.
"Hey!"
"What?"
"I'm a government official, not your personal ATM, Brownie!"
"You're a rich government official."
Cana grinned wickedly.
"Besides, you owe me for keeping your secret research projects away from the Council."
"I don't have secret research projects."
Kai gave her an offended look.
"I have... unregulated educational inquiries."
"Same difference."
She laughed, taking a generous gulp of her drink.
Kai shook his head and ordered something for himself.
For a while, they simply sat together, enjoying the familiar atmosphere.
Cana rested her elbow against the counter, watching him over the rim of her stein.
"Thanks for coming out, Kai."
He glanced sideways.
"It's good to just drink with you like old times."
Kai smiled.
"Just say that you like drinking on my tab, Cana."
"Maybe I do."
"At least you're honest."
She laughed, nudging his shoulder.
For a moment, she simply watched him.
There was something comforting about these little moments.
No Ministry paperwork. No royal responsibilities. No dangerous research projects or complicated magical theories.
Just the two of them.
The way it had been for years.
"What's with that look?" Kai asked, catching her staring.
"Nothing."
Cana took another drink.
"I'm just wondering how much longer I can keep exploiting your generosity."
"At least you're self-aware."
"Don't worry, slacker."
She grinned and slung an arm around his neck, pulling him into a comfortable side-hug.
"You're stuck with me."
Kai gave an exaggerated sigh, then casually draped an arm around her shoulders.
"Pretty sure you're the one stuck with me."
Cana laughed, leaning into his side.
Maybe that was true.
But she didn't mind being stuck with him. Not one bit.
Thursday
Juvia, meanwhile, had been looking forward to her outing for practically the entire week.
Kai accompanied her to the sprawling aquariums near Crocus's lower fountains.
The facility was an impressive structure, with enormous glass enclosures containing aquatic species from all across Fiore and even several imported varieties from distant continents.
Soft blue illumination reflected off the surrounding walls, creating the illusion that the visitors were walking beneath the surface of an enormous ocean.
Juvia was thoroughly enchanted.
"Look, Kai-sama!"
She pointed towards a pair of glowing blue angelfish swimming behind the glass.
"They're swimming together in perfect harmony! Just like Juvia and Kai-sama walking through life!"
Kai examined the fish.
Then he glanced down at her beaming face.
"Pretty cool, rain-girl."
He paused.
"Though I'm fairly certain those two are fighting over a piece of algae."
Juvia gasped.
Her hands flew to her chest.
"A passionate struggle for dominance! Even better!"
Kai shook his head, laughing.
He allowed her to drag him towards the next display, occasionally stopping when she wanted to explain some interesting aspect of the aquatic creatures.
Surprisingly, her explanations were often quite insightful.
She pointed out how certain species controlled their movement through subtle changes in water pressure, how others maintained their orientation through instinctive adjustments, and how some could alter their bodies to navigate extremely narrow spaces.
Kai listened with genuine interest.
He even made a few notes.
For Juvia, it was an almost perfect afternoon.
She had Kai's company, an entire aquarium to explore and, most importantly, several hours in which his attention wasn't divided between a dozen different research projects.
She was already planning their next outing.
Throughout the week
Princess Hisui became a constant presence in both the girls' activities and Kai's laboratory.
Freed from the rigid expectations of royal court life, she quickly grew comfortable spending time with the Fairy Tail mages.
Mira, Cana and Juvia treated her less like a princess and more like a younger sister.
They took her shopping for ordinary clothes, introduced her to various street foods and encouraged her to experience parts of Crocus that she would rarely have visited under normal circumstances.
Hisui, for her part, proved to be an enthusiastic participant.
She particularly enjoyed spending her evenings in Kai's laboratory.
Sometimes she sat beside Mira, chatting about their outings. Other times she watched Kai work, fascinated by the elaborate runic structures that appeared and disappeared across his drafting station.
And whenever she decided that he had been working for too long, she made absolutely no effort to hide her opinion.
"Director Sunveil!"
One afternoon, she marched into the laboratory with her hands on her hips.
Kai didn't even look up.
"Yes, Your Highness?"
"By royal decree of the Princess of Fiore, you are hereby ordered to stop writing equations and eat this slice of berry cake!"
She placed a small plate directly in front of him.
Kai stared at it.
Then at her.
Then back at the cake.
"That's a rather suspicious use of royal authority."
"It is an important royal responsibility!"
"Naturally."
He picked up the fork.
"Wouldn't want to undermine the monarchy."
Hisui smiled triumphantly.
The cake decree had been successful once again.
The Archive Breakthrough and Blue Pegasus Panic
By Friday afternoon, Kai had made substantial progress.
The foundational theory of Archive Magic was considerably more straightforward than he had initially expected.
Its underlying structure relied on the organization of information into standardized magical data matrices, allowing the user to store, retrieve and project information through a controlled magical interface.
After several days of experimentation, Kai had successfully established a basic Archive framework.
A translucent blue screen hovered in front of his face.
He moved his fingers.
The interface responded immediately, displaying several stored text files and neatly arranged information categories.
He could scroll through entries, retrieve specific records and project basic information matrices.
It was crude, but functional.
Unfortunately, the real challenge began when he attempted to integrate it with Scan.
Kai stood before a floating projection of his experimental scanning array.
Several golden runic structures rotated slowly around a central lacrima.
He activated the system.
A thin wave of ethernano expanded across the room, collecting information from the surrounding objects.
For a brief moment, the Archive interface flickered.
Then the display dissolved into static.
Kai stared.
"...Dammit."
He rubbed his temples.
"The data translation isn't smooth."
He pulled up the relevant matrices.
"Archive relies on a standardized runic compression algorithm, while my Tinkerer Arts process raw ethernano at a significantly higher frequency. When the scanner feeds information into the Archive framework, the compression channels can't keep up."
He examined the diagnostic results.
A three-second processing delay.
Three seconds.
In ordinary research, that was practically nothing.
In combat, it was an eternity.
He leaned back in his chair.
"I don't need another theoretical manual. I need someone who's actually mastered this magic."
His fingers tapped against the desk.
Someone who understands the practical optimization of Archive's compression channels...
Then his eyes widened.
"Hibiki!"
He straightened.
"Hibiki Lates!"
Of course.
The Blue Pegasus mage was widely recognized for his exceptional command of Archive Magic.
He used it not merely as an information-storage system, but as a real-time tactical management network, capable of transferring maps, spell data, strategic instructions and other information directly into the minds of his teammates.
Exactly the kind of expertise Kai needed.
"Consulting an active specialist is a hundred times faster than trying to brute-force the equations myself."
He stood.
"Now, where are those girls?"
A few minutes later, he found Mira, Cana, Juvia and Hisui sitting in the sunlit parlour of their private palace suites.
A selection of tea and afternoon pastries covered the table.
"Hey, ladies."
All four looked up.
Kai leaned against the doorway.
"Quick update. I might have to make a short trip out of Crocus."
Mira set down her teacup.
"A trip? Where are you going?"
"Blue Pegasus."
Kai entered the room.
"I need to consult Hibiki Lates about high-frequency Archive compression. Trying to figure out the practical optimizations from books alone is taking longer than expected."
Cana sighed dramatically, sinking deeper into her armchair.
"Great. So you're skipping out on our Crocus week to hang out with the Pegasus playboys?"
Juvia's expression immediately fell.
"Kai-sama is leaving Juvia behind...?"
Kai looked between them.
Then he paused.
A small smile appeared.
He reached into his jacket and retrieved the folded theatre flyer.
"Hey, Clouds."
Mira looked up.
"Did Master Makarov mention anything about contacting Master Bob regarding the Onibus performance?"
"Oh!"
Her expression brightened as she recalled their earlier conversation.
"Yes, actually. Master Makarov mentioned that Master Bob was planning to attend opening night as a special guest."
Kai's smile widened.
"Perfect."
He tapped the flyer against his palm.
"Why travel all the way to Blue Pegasus when I can simply have Master Bob bring Hibiki straight to Onibus?"
The room fell silent.
Then Hisui's eyes lit up.
"So you're coming with us?"
"Looks like it, Princess."
Kai tossed the flyer into the air and caught it.
"I get to watch Natsu ruin a theatrical production, and I get to hijack Hibiki for a three-hour technical consultation."
He grinned.
"It's a win-win."
Cana laughed.
"You're unbelievable."
"Thank you."
"That wasn't a compliment."
"I choose to interpret it as one."
Meanwhile, at Fairy Tail...
The afternoon was shockingly peaceful.
With Natsu, Gray, Erza and Lucy already in Onibus preparing for their theatrical disaster, Laxus away on a solo quest, and several of the guild's usual troublemakers absent, the main hall was unusually quiet.
Warm sunlight streamed through the windows.
Master Makarov sat comfortably at the bar, enjoying a cup of warm sake.
He let out a deep, satisfied sigh.
"Ah... peace."
He took another sip.
"True, beautiful peace."
Laki Olietta, who had temporarily taken over some of the guild's administrative duties while Mira was away in Crocus, approached the bar carrying a glowing blue communication lacrima.
"Master."
Makarov glanced up.
"Yes, Laki?"
"Kai is calling from the capital."
Makarov's expression changed.
"Kai?"
He set down his cup and accepted the lacrima.
"What does that brat want now?"
The communication crystal illuminated.
A moment later, Kai's projected face appeared above its surface.
"Hey, Gramps!"
He raised a hand.
"How's the quiet life treating you?"
"It was treating me wonderfully until you called."
Makarov grumbled, though a small smile tugged at the corners of his mouth.
"What's the update from Crocus? Are the girls causing trouble?"
"Nah. They're fine. Princess Hisui has been feeding them royal pastries all week."
Kai smirked.
"Listen, Gramps. Quick question. Did you invite Master Bob to the Onibus performance?"
"I did."
Makarov nodded.
"Bob loves theatrical productions. He confirmed he'll be attending opening night."
"Awesome. Do me a favour."
Kai leaned slightly closer to the projection.
"Contact Bob and ask him to bring Hibiki Lates along. I've got a few research questions about Archive Magic that I'd like to discuss with him."
Makarov squinted.
"Archive Magic?"
He leaned back.
"What are you cooking up down there, Kai?"
"Just some light scholarly reading, Gramps."
Kai offered an innocent smile.
"Nothing to worry about."
Makarov stared at him.
He knew better.
Whenever Kai took an interest in another mage's magical discipline, it usually resulted in some rather ambitious experiments.
And occasionally, a few unfortunate incidents.
"Fine. I'll contact Bob."
"Thanks, Gramps. See you in Onibus."
The projection vanished.
Makarov stared at the silent lacrima for several seconds.
Then he sighed.
"That boy..."
He picked up his sake again.
"Something tells me Hibiki won't be enjoying this."
Blue Pegasus: An Unfortunate Summons
Over at the Blue Pegasus Guild, Master Bob was enjoying a particularly pleasant afternoon in his luxurious pink office.
A delicate watering can rested in his hand as he lovingly tended to a collection of rare potted orchids.
"Grow big and fabulous, my little darlings~"
The office door opened.
Hibiki Lates stepped inside, holding a glowing communication lacrima.
"Master Bob."
He brushed his blond hair back with his usual effortless charm.
"Master Makarov of Fairy Tail is on the line. He says it's regarding the Onibus theatre performance."
"Oh, Makarov~!"
Bob practically squealed.
He set down the watering can and accepted the lacrima.
"Hello, hello, my favourite old grumpy-pants!"
The conversation continued for several minutes.
There was plenty of laughter, a few comments about the upcoming performance and some enthusiastic discussion about the theatre.
Hibiki waited patiently near the door.
Then, just as Bob was about to end the conversation, his expression brightened.
"Oh, really?"
He clasped his hands together.
"Well, of course, of course! We'll be there!"
The communication ended.
Bob placed the lacrima on his desk.
"Hibiki, darling! Wonderful news!"
Hibiki turned.
"Yes, Master?"
"We're attending Fairy Tail's theatre show in Onibus. And Makarov mentioned that Kai Sunveil specifically requested that you come along!"
The name had barely left Bob's mouth when Hibiki's expression collapsed.
His eyes widened.
The colour drained from his face.
For one truly remarkable moment, a translucent representation of his soul appeared to float out of his mouth.
"K-Kairos Sunveil?!"
His voice cracked.
"The Director of Research?!"
Bob blinked.
"Yes, dear!"
"The same Kai Sunveil who once tried to pull Master Ichiya apart from opposite sides because he was concerned that his height might be affecting his posture?!"
"The very same!"
Bob smiled brightly, apparently unaware that Hibiki's expression had grown considerably more troubled.
"He says he'd like to have a little discussion with you about your Archive Magic!"
"A... A DISCUSSION?!"
Hibiki grabbed his head.
For a brief moment, he simply stood there, staring at his master as though hoping the man would realise what he'd just said and take it back.
He didn't.
Hibiki knew Kai Sunveil. Not particularly well, thankfully, but well enough to understand that the word discussion could mean several very different things when it came from him.
Kai had a peculiar talent for making people regret ever crossing his path.
It was especially unfortunate for Blue Pegasus, whose members had a habit of treating every attractive man they encountered as an opportunity to demonstrate their gentlemanly charm. Kai, being rather unfortunate in the sense that he was handsome enough to attract their attention, had been subjected to more than his fair share of their antics during their earlier meetings.
He had responded in kind.
Only, unlike them, Kai never seemed to lose his composure. He would smile, offer some thoughtful compliment, ask if they were feeling well, and then proceed to subject them to some absurdly elaborate prank under the guise of helping.
The worst part was that he always acted genuinely concerned.
Hibiki had once received a lengthy explanation about the importance of maintaining proper magical circulation, followed by an impromptu demonstration that left him questioning several of his life choices.
And Kai had been so polite throughout the entire ordeal.
"Master Bob, you don't understand!"
Hibiki took a step backwards, one hand catching the doorframe as though he needed something solid to keep himself upright.
"He doesn't just want help with magic! He'll examine my Archive framework, dissect its compression channels, ask me a hundred questions, and then probably use me to test some horrifying new spell!"
He tightened his grip on the frame.
"And he'll do it all while smiling and telling me how much he appreciates my cooperation!"
Bob tilted his head.
"That sounds rather considerate, doesn't it?"
Hibiki stared at him.
"MASTER! THAT'S EXACTLY WHAT MAKES IT TERRIFYING!"
He looked towards the ceiling, silently wondering what he had done in a previous life to deserve this.
Of all the people Kai could have asked to discuss Archive Magic with, why did it have to be him?
Bob tilted his head.
"Now, now, Hibiki. I'm sure you're exaggerating."
"I'm not!"
Hibiki spun around.
"I'm calling in sick!"
He marched towards the exit.
"I have a sudden, incurable case of... Magic Deficiency Syndrome!"
Before he could escape, the door swung open.
Standing in the hallway were Ichiya Vandalay Kotobuki and the rest of the Trimen.
Eve Tearm.
Ren Akatsuki.
And, unfortunately for Hibiki, Ichiya himself.
"Halt, my dear Hibiki!"
Ichiya struck a flamboyant pose, releasing a cloud of sparkling perfume.
"Do I smell... fear?!"
His expression turned solemn.
"And, even worse, do I smell the terrifying scent of the capital's young genius?!"
"Master Ichiya!"
Hibiki practically lunged towards him.
"Help me!"
He grabbed the older mage's jacket.
"Kai Sunveil wants to meet me!"
Ren crossed his arms.
His expression was unusually serious.
"Hibiki..."
He shook his head.
"You can't refuse a request from Director Sunveil. The man has official royal backing, terrifying shadow magic and a personal interest in acquiring practically every piece of technical information he can get his hands on."
He paused.
"If you run, he might simply find you."
Eve nodded frantically.
"Yeah! And if you try hiding, he might consider it an engineering challenge and build some kind of automated tracking Lacrima just to find you!"
Hibiki stared at them.
"Why are none of you helping me?!"
"Accept your destiny, Hibiki!"
Ichiya raised one finger dramatically.
"Face the Director with MEEEN! Bask in the parfum of scientific torment!"
Hibiki slowly slumped against the doorframe.
His soul seemed to hover halfway out of his body.
"My life is over..."
Bob, meanwhile, simply clapped his hands together.
He found the entire scene thoroughly delightful.
The Royal Tax
Back at Mercurius Palace, Crocus...
Kai walked into the private parlour with a satisfied smirk.
"Alright, ladies. It's official."
He clapped his hands together.
"Master Bob is bringing Hibiki straight to Onibus. We're clear to leave whenever you're ready."
A wave of excitement swept through the room.
"Yay!"
Hisui clapped her hands.
"A theatre trip!"
"Juvia will begin packing the travel cloaks immediately!"
Juvia practically sprinted towards her bedroom.
Cana watched her go, shaking her head.
"Finally. I was getting tired of watching you stare at chalkboards all day, slacker."
Mira smiled warmly.
"Thank you for arranging that, Kai. I know how much your research means to you."
"Hey, I know how to balance work and play."
Kai rolled his shoulders.
"Now, let me grab my coat, and we can head to the train station—"
"Not so fast, Director Sunveil."
Kai stopped.
Hisui had stepped directly into his path.
The little princess planted her feet firmly, puffed out her chest and looked up at him with an expression of absolute authority.
Kai raised an eyebrow.
"Yes, Your Radishness?"
"Before we can leave for Onibus, you have an official duty to fulfil."
She pointed a delicate finger at his chest.
"You must accompany me to the royal chambers and brief my father, King Toma."
Kai stared at her.
Then he slowly tilted his head backwards.
"Urrrrgh..."
He dragged out the sound with theatrical suffering.
"The Royal Tax strikes again. Can't I just send him a written summary through a carrier pigeon?"
"Absolution refused!"
Hisui huffed.
"This is an important state matter! Father has been waiting all week to hear your official report regarding your fight with Jose Porla!"
Kai regarded the tiny princess for several seconds.
Then a mischievous smile appeared.
Before Hisui could react, he reached down, slipped his hands beneath her arms and effortlessly lifted her off the ground.
"E-EEK?!"
In one smooth motion, he settled her on top of his shoulder.
Her little boots dangled beside his chest as she instinctively grabbed onto his dark hair to steady herself.
"K-KAI! What are you doing?!"
"Taking the fast transport."
Kai turned towards the corridor.
"If I have to discuss bureaucratic reports with your father, I'm bringing my live royal pass along."
"Put me down!"
Hisui's face turned bright red.
"I am the Princess of Fiore! I have dignity!"
"Dignity is overrated, Radish Head."
Kai started walking.
"Now hold on tight. We've got a King to disappoint!"
Hisui tried to maintain her stern expression.
She really did.
But the absurdity of the situation, combined with Kai's completely shameless grin, eventually proved too much.
A giggle escaped her.
Then another.
"You're impossible!"
"That's what they tell me."
His laughter echoed down the grand stone corridor.
Behind them, Mira and Cana stepped out of the parlour.
They watched Kai carry the squirming princess towards the royal chambers, both wearing amused expressions.
Juvia hurried past them in the opposite direction, carrying three enormous travel trunks.
"Juvia is ready!"
Cana stared.
"How many clothes are you planning to take?"
"Enough!"
Mira laughed softly.
Her fingers briefly rested against the dark wooden flute secured at her waist.
It had been a busy week.
There had been research, unexpected discoveries, shopping trips, expensive drinks, romantic misunderstandings and more than a few royal pastries.
But beneath all the chaos, something had changed.
And their next destination promised an entirely different kind of trouble.
After all, Fairy Tail was about to put on a theatrical performance.
And with Natsu, Gray, Erza, Lucy and Happy involved...
There was very little chance that anything would go according to plan.