The Yuuki estate was silent.
Long before dawn broke over the mountains, the residence rested beneath a blanket of darkness. Moonlight filtered through the paper windows, casting pale silver patterns across polished wooden floors. Outside, a gentle breeze stirred the branches of the ancient cedar trees surrounding the estate, carrying with it the crisp scent of the coming morning.
It was only four o'clock.
Most of the household was still asleep.
Inside one of the upstairs bedrooms, Serena lay curled beneath a thick blanket, breathing slowly and peacefully. The events of the previous few days—the Calamity-Class battle, her birthday, reuniting with Tamayo, and learning that she would finally inherit her family's Cybernetic Protocol—had exhausted both her body and mind.
For once...
She was sleeping soundly.
The bedroom door slid open with barely a sound.
A familiar figure quietly stepped inside.
Tamayo.
Already dressed in light training clothes beneath a long white jacket, she carried herself with the calm confidence of someone accustomed to greeting the sunrise rather than sleeping through it.
She looked toward the sleeping Serena and smiled.
"...Still exactly the same."
Walking over to the futon, she knelt beside her younger sister.
"Serena."
No response.
Only a soft mumble beneath the blanket.
Tamayo gently shook one shoulder.
"Wake up."
Another sleepy noise.
"Come on."
Still nothing.
Tamayo sighed with an amused smile.
"You wanted to become a Geist, remember?"
A muffled voice emerged from beneath the blanket.
"...Mmm..."
Then, without opening her eyes, Serena lazily reached out and pushed at the hand that was trying to wake her.
"...Yuma..."
Tamayo blinked.
Serena continued speaking, still completely asleep.
"...It's still too early..."
She shifted onto her side.
"...Stop moving me..."
Another sleepy mumble escaped her lips.
"...I'm trying to sleep..."
Silence.
Tamayo stared.
Then...
She burst into laughter.
The quiet bedroom echoed with her cheerful giggles as she tried—and failed—to compose herself.
"My, my..."
She wiped a small tear from the corner of her eye.
"So that's how it is."
Serena's eyebrows twitched.
"...Huh...?"
The laughter finally reached her half-asleep mind.
Slowly...
Very slowly...
She opened one eye.
Her vision remained blurry.
"...Yuma...?"
She rubbed her eyes.
The figure standing beside her slowly came into focus.
Long chestnut hair.
A warm smile.
Not black hair.
Not Yuma.
"..."
"..."
"...Sis?"
Tamayo waved cheerfully.
"Good morning."
Serena froze.
Her face immediately turned bright red.
"..."
"..."
"...AAAAAAAAAH!"
Without thinking, she grabbed the nearest pillow and hurled it with all her strength.
Tamayo calmly leaned half a step to the side.
The pillow flew harmlessly past her before bouncing off the wall.
Thump.
Tamayo smiled.
"You've got good aim."
"I-I DIDN'T MEAN—"
"Oh?"
"You called your husband by name."
"I DIDN'T!"
"You absolutely did."
"I WAS ASLEEP!"
"So?"
"I THOUGHT IT WAS HIM!"
Tamayo folded her arms, clearly enjoying every second of Serena's embarrassment.
"I wonder what he'd think if he heard that."
"He'll never hear about it!"
"I might tell him."
"You wouldn't."
"I absolutely would."
Serena buried her face in both hands.
"...Why did I wake up today..."
Tamayo laughed again before gently patting her younger sister's head.
"Relax."
"I'm only teasing you."
"...You're horrible."
"I've been told that."
The older sister's smile gradually became more composed.
Then she glanced toward the window.
"The sun will be up soon."
Serena followed her gaze.
Outside...
The sky was still dark.
Only the faintest hint of blue rested along the distant horizon.
"...It's four in the morning."
"It was."
Tamayo checked the clock.
"It's closer to five now."
Serena groaned dramatically.
"...That's not any better."
Tamayo stood.
"Get dressed."
Serena looked up.
"...Already?"
"We're leaving soon."
"...Leaving?"
"The temple."
Those two words immediately chased away the last remnants of sleep.
"The temple?"
Tamayo nodded.
"Our family's Cybernetic Protocol isn't something you learn in a backyard."
She smiled.
"It begins where it was protected."
"...The White Fox Temple."
Serena sat upright.
Her expression immediately became serious.
"...Today?"
"Today."
"I thought we'd train here."
Tamayo shook her head.
"The techniques you'll inherit have been preserved there for generations."
She walked toward the door before looking back over her shoulder.
"The temple itself is part of the training."
"...You'll understand once we arrive."
Serena nodded slowly.
"...Right."
For the first time that morning...
Excitement replaced her exhaustion.
Tamayo quietly slid the bedroom door closed behind her.
"I'll give you thirty minutes."
"And Serena?"
"...Yeah?"
"Try not to mistake me for Yuma again."
"...SIS!"
Tamayo's laughter echoed down the hallway.
Nearly an hour later...
The eastern sky had begun turning pale orange.
Morning mist drifted lazily over the roads surrounding the Yuuki estate.
Serena stepped outside carrying a small backpack filled with training clothes, bottled water, and a notebook.
She had exchanged her pajamas for comfortable athletic wear beneath a light jacket.
The cool morning air brushed gently against her face.
She inhaled deeply.
"...Feels nice."
Parked near the front entrance was a dark-colored SUV.
Tamayo stood beside the driver's door, finishing a cup of coffee.
She smiled when she saw Serena.
"Ready?"
Serena adjusted her backpack.
"...As ready as I'll ever be."
"Good."
The sisters climbed into the vehicle.
The engine started with a quiet hum.
As the estate gates slowly opened, the car rolled forward onto the empty road.
Neither sister spoke immediately.
The city gradually disappeared behind them as they traveled farther into the countryside.
Buildings became smaller.
Traffic faded away.
Rolling hills and dense forests replaced busy streets.
Morning sunlight filtered through towering cedar trees, painting shifting patterns across the winding mountain road.
Serena rested her head lightly against the passenger-side window.
"...It's been years since I came this way."
Tamayo kept her eyes on the road.
"I know."
"I almost forgot how peaceful it is."
"You'll be seeing a lot more of it."
The road continued climbing higher.
Higher.
The air became cooler.
The forest thicker.
Stone lanterns eventually began appearing beside the roadside at regular intervals.
Their surfaces were weathered with age, covered in patches of moss that hinted at centuries of history.
Tamayo finally broke the silence.
"We're almost there."
Serena looked ahead.
Through the morning mist...
She could just make out the outline of an enormous crimson torii gate standing among the ancient trees.
Beyond it...
Hidden deep within the mountains...
Awaited the place that had safeguarded her family's legacy for generations.
The White Fox Temple.
And with it...
The beginning of her true training.
The morning sun continued its slow ascent into the sky as Tamayo's vehicle wound steadily through the mountain roads.
Nearly two hours had passed since the sisters had departed from the Yuuki estate.
The bustling streets of Tokyo were now nothing more than a distant memory.
Concrete buildings had long since given way to endless forests.
Towering cedar trees lined both sides of the narrow road, their ancient trunks rising high enough to obscure much of the morning sunlight. Shafts of golden light pierced through the dense canopy, illuminating drifting mist that clung stubbornly to the mountainside.
The farther they drove...
The quieter the world became.
There were no traffic lights.
No crowded intersections.
No distant sounds of trains or city life.
Only the gentle hum of the engine.
The occasional call of birds hidden somewhere among the trees.
And the rhythmic crunch of tires rolling across the weathered mountain road.
Serena rested her elbow against the passenger-side window.
She quietly watched the scenery pass by.
"...It's changed."
Tamayo glanced at her for only a brief moment before returning her attention to the road.
"A little."
"I remember there being more houses."
"There were."
"What happened?"
"The younger generation moved into the cities."
Tamayo smiled faintly.
"The mountains became quieter."
Serena nodded slowly.
She remembered visiting this place as a child.
Back then...
The village beneath the temple had been lively.
Children played near the stone bridges.
Small family-owned shops sold charms and handmade sweets to visitors.
Pilgrims often climbed the mountain steps carrying offerings to the shrine.
Now...
Most of those buildings stood empty.
Time had slowly reclaimed the village.
The silence wasn't lonely.
It was peaceful.
Almost sacred.
Tamayo finally broke the silence.
"Nervous?"
Serena chuckled softly.
"...A little."
"Good."
"Huh?"
"If you weren't nervous..."
"...I'd think you weren't taking this seriously."
Serena smiled.
"...Fair enough."
Several more minutes passed.
The mountain road began climbing more steeply.
The air became noticeably cooler.
Mist drifted lazily across the road ahead before disappearing behind them.
Then—
Tamayo slowed the vehicle.
Serena instinctively looked forward.
Her eyes widened.
Standing proudly atop the mountain...
Bathed in the golden light of the early morning...
Was an enormous crimson torii gate.
Its wooden pillars towered above the surrounding forest.
Ancient stone fox statues stood on either side of the entrance.
Moss covered portions of the weathered stone, silently revealing centuries of history.
Beyond the gate...
Hidden among towering cedar trees...
A sprawling shrine complex slowly came into view.
Several traditional wooden buildings stretched across the mountainside, connected by polished stone pathways and long covered walkways.
White banners bearing the Yuuki family crest fluttered gently in the mountain breeze.
Farther uphill...
A massive temple overlooked everything below.
Its dark tiled roof shimmered beneath the morning sun.
Serena stared.
"...It's beautiful."
Tamayo smiled.
"Welcome back."
For a long moment...
Serena simply looked.
She hadn't returned here since she was a child.
Yet somehow...
It still felt like home.
The vehicle slowly rolled through the open temple gates before continuing along a narrow stone path leading toward a modest parking area surrounded by maple trees.
Tamayo gently applied the brakes.
The engine quietly shut off.
Silence returned.
Only birdsong echoed throughout the mountain.
Neither sister stepped out immediately.
Instead...
Serena continued staring at the temple.
"...Tamayo."
"Hm?"
"What exactly..."
"...are you going to teach me?"
Tamayo rested both hands on the steering wheel.
She answered without hesitation.
"...Haikirin."
The single word echoed inside the quiet vehicle.
Serena's expression immediately changed.
"...What?"
She slowly turned toward her sister.
"...Haikirin?"
Tamayo nodded once.
"Yes."
Serena couldn't believe what she had heard.
"...You're serious?"
"I am."
Her heartbeat quickened.
"...No..."
"...That's impossible."
Tamayo remained calm.
Serena shook her head repeatedly.
"Haikirin isn't just another sword technique."
"It's..."
She searched for the proper words.
"...It's one of the highest-level techniques our family possesses."
Tamayo quietly listened.
Serena continued.
"I've only ever heard stories about it."
"Dad barely talks about it."
"The elders wouldn't even answer my questions."
She looked directly at her older sister.
"...You know..."
Her voice lowered.
"...Not even Dad can properly use Haikirin."
Silence.
The statement lingered between them.
Reige Yuuki.
One of the strongest active Geists in Japan.
A warrior respected by countless organizations.
Yet even he—
Could never fully master that technique.
Tamayo finally smiled.
"...I'm fully aware."
She calmly opened the driver's door.
The cool mountain air immediately flowed into the vehicle.
Stepping outside, she stretched briefly before looking toward the towering temple.
Serena quickly followed.
"...Then why?"
She closed the passenger door behind her.
"If Dad couldn't master it..."
"...Why do you think I can?"
The question carried genuine uncertainty.
Not fear.
Not doubt in Tamayo.
Only doubt in herself.
Tamayo stood quietly for several moments.
The mountain breeze gently moved her long hair.
Finally—
She turned.
Meeting Serena's eyes.
"...Who do you think you're talking to?"
Serena blinked.
"...Huh?"
Tamayo smiled.
Not arrogantly.
Confidently.
"I'm your sister."
She stepped closer.
"I've watched you grow since you were born."
"I know your habits."
"I know your strengths."
"I know your weaknesses."
"And..."
Her smile softened.
"I know the potential hiding inside you."
Serena remained silent.
Tamayo continued walking toward the stone steps leading into the shrine grounds.
Serena naturally followed beside her.
"You've always underestimated yourself."
"You compare yourself to Dad."
"To me."
"To other Geists."
"But you've never stopped to ask..."
She looked toward the temple overlooking the mountain.
"...What makes Serena Yuuki different?"
The question lingered.
Serena couldn't answer.
Tamayo smiled.
"Your spiritual compatibility."
"Your instincts."
"The way your spiritual pathways naturally flow."
"I've never seen another member of our family quite like you."
Serena stared.
"...Really?"
Tamayo nodded.
"I wouldn't bring you here otherwise."
They slowly climbed the broad stone staircase together.
Each step echoed softly through the quiet mountain air.
Temple bells rang somewhere in the distance.
The peaceful sound spread throughout the forest.
Tamayo eventually stopped halfway up the staircase.
She looked back toward Serena.
"You asked me why I believe you can learn Haikirin."
"I'll answer properly."
Her expression became serious.
"For twenty generations..."
She slowly raised one finger.
"Our family has produced hundreds of Geists."
Another finger.
"Dozens die at a young age"
A third
"A certain amount became masters."
A fourth.
"Many protected this temple."
Then—
She opened her entire hand.
"But throughout twenty generations..."
Her voice carried unmistakable pride.
"There have only been..."
"...five known users of Haikirin."
Serena unconsciously held her breath.
Five.
Only five.
Across twenty generations.
The rarity alone was difficult to comprehend.
Tamayo smiled.
"...Do you know why?"
Serena slowly shook her head.
"Because Haikirin doesn't choose strength."
"It doesn't choose experience."
"It doesn't choose talent alone."
She gently placed one hand over her own heart.
"It chooses understanding."
"The technique reflects the heart and will of its user."
Serena quietly absorbed every word.
Tamayo then laughed softly.
"And before you ask..."
"...Yes."
"I am one of those five."
Serena's eyes widened.
"I know."
Tamayo's smile became almost playful.
"But there's one thing you don't know."
She crossed her arms confidently.
"Among those five..."
A gentle mountain breeze swept across the shrine grounds.
White paper streamers tied to sacred ropes danced through the air.
Temple bells rang once more.
Tamayo looked directly into Serena's eyes.
"...I'm by far considered the best."
Silence.
Not arrogance.
Not vanity.
Simply confidence born from decades of relentless discipline.
She smiled warmly.
"So..."
She extended her hand toward her younger sister.
"If anyone in this world can teach you Haikirin..."
"...It's me."
Serena looked at the outstretched hand.
Then toward the ancient temple standing proudly behind her sister.
Her uncertainty slowly faded.
Replaced by excitement.
Determination.
Hope.
Slowly...
She smiled.
"...Then..."
She accepted Tamayo's hand.
"...Please teach me."
Tamayo's smile widened.
"Good."
She gently squeezed Serena's hand before releasing it.
"Because from this moment onward..."
She turned toward the towering temple.
"...your peaceful mornings are officially over."
Serena blinked.
"...Wait..."
"...What does that mean?"
Tamayo simply smiled.
"You'll find out in about five minutes."
For reasons Serena couldn't explain...
That answer worried her far more than learning one of the oldest techniques in her family's history.
High above them...
The White Fox Temple stood silently beneath the morning sky.
For generations it had guarded the Yuuki family's greatest secrets.
Now...
Its gates slowly opened once more.
Ready to welcome its next successor.