The Tempest Rail-X prototype touched down in the clearing with all the grace of a dragon doing a victory dance—wings folding with a theatrical whoosh, claws retracting into sleek obsidian panels, and the dragon-head front module letting out a cheerful synthetic ding like a microwave announcing perfect ramen. The crowd of monsters who had gathered (half curious, half because the energy ripple had interrupted lunch) erupted into cheers. But the real show was just beginning.
Rimuru hovered at eye level with the cockpit, already sensing the storm of chaos brewing. "Okay, everyone. That was the warm-up loop. Milim, hand over the controls before—"
"Too late!" Milim cackled from the pilot seat, eyes glowing with pure Demon Lord destruction-joy. She slammed the glowing "BOOST" rune that Takumi had cheekily labeled "For Maximum Anime Energy." The Rail-X's infinite energy generator surged, and the entire carriage lit up like a festival firework. "Second run! This time with style!"
From the depths of the tenth floor, Veldora's voice boomed across the mental link, wise and rumbling yet laced with that unmistakable shut-in otaku glee. "Hah! Observe, mortals of Tempest—the probability of Milim turning this into a demolition derby is precisely 94.7%. Takumi, activate the spectator mode. I require popcorn. Extra butter. And a dramatic slow-motion filter on the feed."
Takumi's voice cut in, crisp as a programmer debugging at 3 a.m. "Takumi that, Dragon Bro. Live commentary track engaged. Infinite energy flow stable at 200%—no lag, no crashes. Unlike my old VRMMO builds where one typo would spawn infinite angry slimes. Milim, if you break the sound barrier, try not to yeet any goblins into orbit, yeah?"
Milim grinned like she'd been handed the ultimate cheat code. "Yeet? I like this Takumi guy already! Vroom time!"
The Rail-X shot forward again, transforming mid-sprint into full dragon-mecha mode. Claws dug into the dirt for traction, wings flared for balance, and it executed a perfect powerslide that left glowing mana trails spelling out "Tempest Rules" in mid-air. The crowd ooh-ed. Then Gobta—still riding the accidental skill gift from earlier—zoomed into the mix at hyper-speed.
"Boss! I can't stop! My legs are doing the thing!" the goblin rider yelped, afterimages trailing behind him like a bad special effect. He tried to salute and immediately tripped over his own upgraded [Goblin Step], cartwheeling straight into the Rail-X's path.
Benimaru, standing at the sidelines with the posture of a man filing his tenth resignation letter, lunged forward. "Gobta! Brake! Use your head for once—literally!"
Too late. Gobta bounced off the carriage like a pinball, ricocheting into a stack of supply crates that exploded in a shower of colorful prototype parts. One glowing widget landed in his hands and—courtesy of Veldora's Skill Duplication—promptly gifted him [Minor Mecha Armor]. Suddenly the goblin was wearing clunky gold-plated leg boosters that made him zoom even faster in erratic circles.
"Waaaaah! I'm a goblin Gundam now?!" Gobta screamed, arms flailing as he accidentally clotheslined three orc soldiers who were trying to help.
Shion doubled over laughing, Oni-giri the First floating serenely beside her with his tiny chef's hat askew. "Magnificent! Lord Veldora's blessings turn even the clumsy into legends! Oni-giri, note the elegance—Gobta is now performing the ancient art of 'accidental ballet.'"
The sentient rice ball bobbed once, voice deadpan and surprisingly deep. "Mistress, with respect, that was less ballet and more 'what happens when you forget to comment out the debug code.' I fear for the structural integrity of the testing field."
Veldora's laugh thundered through the link, scholarly yet utterly gremlin. "Excellent analysis, tiny rice subordinate! Probability that Gobta achieves enlightenment through repeated face-planting: 68%. Takumi, save the replay. We shall title it 'Goblin Physics: A Case Study in Infinite Energy Abuse.'"
"Already clipping it, Dragon Bro. Adding subtitles: 'When the support character goes full DPS by accident.' Rimuru, you seeing this? Your nation's getting free character development DLC. No microtransactions required."
Rimuru pinched the non-existent bridge of his nose so hard his slime form wobbled. "You two are enjoying this way too much. Ciel, can we please add a safety limiter before someone actually achieves orbit?"
Ciel's cool voice replied internally. "Negative, Master. Veldora's new generator treats safety as a 'suggestion parameter.' Current chaos index: delightful."
Milim, meanwhile, had taken the Rail-X into a low-altitude loop-de-loop that somehow incorporated a mid-air transformation back to carriage mode and then back to mecha form with a dramatic roar. The synthetic voice blared: "Ultimate Technique: Dragon Rail Drift! Courtesy of your friendly neighborhood otaku Manas!"
Diablo, clinging to the co-pilot seat with butler-level composure, adjusted his gloves mid-flip. "Lady Milim, might I suggest a slightly less… apocalyptic velocity? The local flora is filing complaints."
"Complaints are for weaklings!" Milim whooped, yanking the controls into a barrel roll that sent a wave of creative energy rippling outward. The anomaly Rimuru had noticed earlier flared again—this time birthing something new. A small, glowing portal popped open beside the track, spitting out a tiny, confused creature: a palm-sized dragon-pixie hybrid with pixelated wings and a tiny programmer's hoodie. It blinked, looked around, and immediately latched onto Gobta's speeding leg like a living keychain.
"New summon detected!" the pixie-dragon squeaked in a voice suspiciously like a system notification. "I am Pixeldora, beta tester of the infinite energy grid! Please insert coins for gacha roll—wait, wrong script!"
Gobta, now carrying an extra passenger, screamed louder. "Boss! It's biting my boosters! Make it stop being cute and helpful!"
The crowd was in stitches. Orcs were placing bets. A group of dryads had formed a cheer squad, waving glowing leaves that spelled "GO GOBTA GO (BUT SLOWER)."
From his throne, Veldora nodded sagely, munching holographic popcorn. "Behold the beauty of uncontrolled creation. Takumi's Otaku Art Creation Techniques have manifested a mascot. Probability of Pixeldora becoming national treasure: 99.9%. I approve. Little brother, consider it my gift—free marketing for the Rail-X line. Limited-edition plushies incoming."
Takumi snickered. "Heh, accidental gacha summon. Classic. Back in my coding days, one overflow error and you'd get infinite loot boxes. Here? We get a flying debug fairy. Rimuru, name him something cool like 'Error-kun' or I'll be disappointed in my isekai legacy."
Rimuru floated down, trying to look authoritative while fighting a grin. "Alright, test concluded! Milim, park it before the entire capital becomes a racetrack. Benimaru, please collect Gobta before he achieves escape velocity. Shion—do not recruit Pixeldora into your cooking squad yet."
Milim skidded the Rail-X to a halt inches from a very nervous-looking tree, striking a pose. "Best. Train. Ever! When do the full-size ones get candy cannons? I vote for strawberry flavor destruction beams!"
Benimaru finally caught Gobta by the collar, the goblin still twitching from residual speed. "My lord… I have aged ten years in ten minutes. Requesting hazard pay in the form of unlimited naps."
Shion beamed, Oni-giri nodding along. "Nonsense! This was a resounding success. Oni-giri has already composed a haiku: 'Dragon train of dreams / Goblin becomes lightning / Ramen sales soar.'"
Oni-giri added dryly, "Second verse: 'Please install brakes.'"
Veldora's voice softened with that rare big-brother warmth beneath the comedy. "Fear not, my faithful subjects. The infinite supply flows steadily—destruction and creation in perfect balance, shared with every soul in Tempest. Takumi and I shall refine the parameters from our sanctum. After all, one must balance world-altering innovation with… critical research."
"Translation: we're binging the new season while patching the code. Multitasking like pros."
Rimuru landed gently on the Rail-X's hood, feeling the warm hum of endless energy threading into his core and outward to every subordinate. The brotherly link pulsed stronger than ever—Veldora the wise, funny, eternally shut-in dragon supplying power and punchlines from his manga fortress, Takumi the reincarnated programmer adding that perfect otaku spark. Chaos had ensued, yes, but it was their chaos. The kind that built legends instead of burning them down.
As the crowd dispersed (Gobta still zooming in lazy circles with Pixeldora cheering him on), a faint new notification pinged in Rimuru's mind: the energy grid had stabilized, and faint creative ripples were already enhancing workshops across the capital. The MagiTrain network was no longer a distant dream—it was happening, one hilarious test at a time.
"Next prototype tomorrow," Rimuru declared, smiling despite himself. "With actual brakes installed. And maybe fewer accidental summons."
Veldora's chuckle echoed like distant thunder. "As you command, little brother. But where is the fun in guaranteed success? Takumi and I shall prepare… surprises."
"Spoiler alert: they involve limited-edition color variants. You're welcome."
The winds over Tempest carried laughter, the faint scent of instant ramen, and the unmistakable hum of a nation leveling up—otaku style.