The transition from the lush, elemental vibrant fields of Teyvat to the jagged, suffocating atmosphere of Rubicon 3 was not a "Loading Screen"—it was a Hard-Crash.
Kenji Sato felt the "Anemo" energy in his lungs suddenly solidify into industrial soot. The prismatic silver of his hair didn't just flicker; it turned a dull, oil-slicked chrome. Beside him, Midoriya, Bakugo, and Shoto weren't just falling; they were being "Compiled" into high-density steel.
Part I: The Cold-Boot
They landed in a desert of ash, surrounded by the towering, skeletal remains of "Mega-Structures" that pierced a soot-black sky. The air hummed with the scream of heavy thrusters and the distant, rhythmic thud of railgun fire.
[NEW SERVER DETECTED: RUBICON 3 (ARMORED CORE VI)]
[LOGIC TYPE: MECHANICAL / KINETIC / CORAL]
[SYSTEM OVERRIDE: PILOT NEURAL-LINK ACTIVE]
"Sato... I can't breathe!" Midoriya gasped, but his voice didn't come from his throat. It came from a Vox-Speaker.
Kenji looked at his friends and felt a surge of "Tactical Data." They weren't humans anymore. To survive the atmospheric pressure of this world, the System had encased their "Soul-Data" into massive, 10-meter-tall Armored Cores (ACs).
Kenji (Callsign: ADMIN): A sleek, silver-and-cyan glint of high-mobility parts, equipped with a Laser Blade and a Multi-Lock Missile Launcher.
Midoriya (Callsign: DEKU-01): A heavy-set, green-armored bipedal unit with "Internal Thrusters" that mimicked One For All's kinetic bursts.
Bakugo (Callsign: GREAT EXPLOSION): A lightweight, reverse-jointed "Glass Cannon" build, carrying dual Napalm Launchers and a massive Plasma Cannon.
Shoto (Callsign: FROST-BURN): A tank-tread chassis capable of switching between Cryogenic Mist and Incendiary Mortars.
"Don't panic!" Kenji's voice crackled over the encrypted comms channel. "Your Quirks have been 'Hard-Wired' into the AC's internal components. This is a Mecha-Server. If you want to move, you have to 'Think' through the Neural Link."
Part II: The Mecha-Virus (The Coral-AFO Fusion)
The Dimensional Breach hadn't just followed them; it had merged with this world's "Coral"—a volatile, sentient energy source. The All For One Virus was no longer a biological parasite; it was an Autonomous AI that was "Infecting" the massive, derelict war machines of Rubicon.
[WARNING: HOSTILE AC-SWARM DETECTED]
[THREAT LEVEL: EXTERMINATUS]
From the ash-clouds emerged hundreds of "MT Units"—automated bipedal tanks—their sensors glowing with the familiar, jagged red-and-black "Corruption" pixels. They weren't just shooting; they were "Uploading" the virus into the local grid.
"They're trying to use the 'Interstellar Transmitters' on this planet to send the virus back to Musutafu!" Kenji realized, his Focus HUD highlighting a massive satellite dish on the horizon. "If that signal hits our world, every phone, every computer, and every Quirk-Database in Japan will be 'Deleted'!"
Part III: The Assault on the Grid
"I'm sick of being a toaster!" Bakugo roared, his AC's reverse-joints snapping as he launched into the air.
He didn't use explosions; he used Assault Boost. His AC became a streak of orange heat, slamming into the center of the MT swarm. He triggered his dual napalm launchers, creating a "Supernova" of industrial fire that melted the corrupted machines into slag.
"Bakugo, watch your EN (Energy) Bar!" Kenji warned, dodging a railgun shot with a Quick-Turn. "In this world, you have a 'Limit' on your output!"
Midoriya engaged his "Full Cowl" boosters, moving with a stuttering, high-speed zig-zag that confused the enemy's lock-on systems. He slammed his AC's reinforced fist into a Corrupted Tetrapod, the kinetic impact shattering the machine's "Stability Bar."
"Shoto! Create a Heat-Sink!"
Shoto's tank-tread AC deployed massive cooling vents, freezing the ground to provide a stable "Firing Platform." He then unleashed a dual-barreled incendiary blast that acted like a "Prominence Burn," incinerating the corrupted data-streams.
Part IV: The Boss – Balteus-AFO
As they reached the satellite dish, the sky darkened. A massive, ringed machine descended—the Balteus—but its missile racks were overflowing with "Corrupted Coral."
[BOSS ENCOUNTER: THE CORRUPTED WATCHMAN]
[LOGIC: PULSE SHIELD / MISSILE SALVO / VIRAL UPLOAD]
"This is the 'Firewall'!" Kenji shouted, his Laser Blade humming with prismatic silver light. "We have to break its 'Pulse Shield' to reach the 'Kernel'!"
The Balteus unleashed a "Macross-style" missile swarm—thousands of red-and-black trails filling the sky.
Kenji didn't dodge. He used The Genesis Protocol (Drive 14). He "Attached" his silver mana to the AC's internal sensors, essentially Hacking the World-Engine.
"EXPANSION: THE ARCHITECT'S DOMAIN!"
Time slowed down. To Kenji, the thousands of missiles weren't threats; they were Object Files. He moved between them, his AC flickering in and out of existence—the 2B-Dash translated into mecha-physics.
He reached the Balteus and performed a Charged Laser Strike. The blade didn't just cut steel; it "Excised" the virus from the machine's motherboard.
"RAIDERS! ALL-STOP! CONCENTRATE FIRE ON THE REVEALED CORE!"
Midoriya, Bakugo, and Shoto unleashed their Ultimate Bursts. The green lightning, orange explosions, and red-blue flames converged into a single point of "Absolute Data."
Part V: The Global Reboot
The Balteus exploded in a wave of white "Coral" light. The red-and-black corruption was vaporized, and the satellite dish—now cleansed—sent out a "Correction Signal" that stabilized the Dimensional Breach.
[QUEST COMPLETE: RUBICON REBOOTED]
[NEW REWARD: INDUSTRIAL OPTIMIZATION (AC-PARTS INTEGRATED)]
[TRANSPORTING... RETURN TO SOURCE SERVER...]
The mechanical bodies of the heroes began to dissolve into pixels. As Kenji was being pulled back, he saw a vision of the next "Loading Screen"—a world of dark forests and towering, gothic castles.
"The next one is Elden Ring... but it's not a 'Dive' this time," Kenji realized, his HUD flickering with a final, chilling message. "It's a Physical Merge."
Aftermath: The Augmented Hero
Kenji landed back in the U.A. locker rooms. He was human again, but his skin felt colder, and his mind felt like it was running on Fiber-Optic Cables.
"You guys okay?" Kenji asked, looking at Midoriya, who was staring at his hands in shock.
"Sato..." Midoriya whispered. "I can still see the 'Targeting Reticles' on the walls."
"We're 'Augmented' now, Izuku," Kenji said, his eyes glowing with a permanent, industrial blue light. "The worlds are merging. We're not just Heroes anymore. We're the Multi-Server Defense Force."
Bakugo stood up, a small, dangerous smirk on his face. "Next time, tell the 'System' to give me more missiles. I liked the missiles."
Kenji Sato: Multiversal Admin Status