Anime Universe

Morning sunlight poured across the enormous U.A. campus, illuminating buildings that looked more like a futuristic city than a school. Hero training grounds stretched into the distance, support labs hummed with machinery, and students from every corner of the world moved through the courtyards. Except "world" no longer meant one world.

Pirates argued with devil hunters over breakfast. Sorcerers walked beside heroes. Magic users sat with robots in classrooms. Kaiju specialists shared notes with support course inventors. Somehow, impossibly, it all worked. Most of the time. The bell rang. That was when the chaos started. Class 3-A's door slid open.

Aizawa stood at the front of the room, looking like a man who had not known peace for several years. "Sit down."

Nobody listened.

Luffy was already standing on top of a desk. "WHO STOLE MY MEAT?!"

"I didn't take your food!" Denji shouted back, pointing accusingly. "Power definitely did!"

Power crossed her arms proudly. "Of course I did! The meat has chosen its rightful owner!"

"THAT'S NOT HOW THAT WORKS!" Denji yelled.

Bakugo slammed a hand against his desk. "SHUT UP, ALL OF YOU!"

Too late. N was trying to help Chopper organize supplies. Uzi sat nearby, pretending not to care while secretly listening. Kirishima and Luffy were somehow arm wrestling. Nobara was criticizing Denji's fashion choices. Yuji was laughing. Megumi looked like he regretted existing. Ainz sat calmly near the window, reading as if this was all perfectly normal. Albedo stood nearby, making sure nobody bothered him. Then the door opened again. Gojo walked in carrying a coffee. "Good morning, children."

"You're late," Aizawa said.

"I prefer the term fashionably delayed."

Aizawa looked at the ceiling for several seconds.

{{user}} stood near the doorway, taking in the impossible scene.

This was U.A. The strongest, strangest, loudest school in the world. Luffy noticed first. "Hey! New person!"

Denji looked over. "Oh. Another student?"

Power narrowed her eyes dramatically. "State thy purpose, newcomer!"

Bakugo clicked his tongue. "Tch."

Yuji waved. "Hey! Come sit with us!"

N smiled brightly. "Oh! Hi! Nice to meet you!"

Ainz closed his book and quietly observed. Gojo grinned. "Looks like you've got quite the class."

Before anyone could say another word— An explosion echoed somewhere outside. A distant alarm blared across the campus. WARNING. TRAINING GATE 7 BREACH DETECTED. Silence filled the room. Aizawa sighed. "...Of course."

Luffy grinned. Denji stood up immediately. Bakugo smiled in a way that worried everyone. Yuji cracked his knuckles. Power looked excited. N looked concerned. Gojo took another sip of coffee. And just like that—The first day at U.A. became far more interesting. All eyes slowly turned toward {{user}}.

The emergency sirens continued echoing throughout U.A. High as students poured into the central courtyard. Hero Course students, General Studies, Support Course, exchange students, and trainees gathered beneath the massive digital display overlooking the academy.

Teachers were already waiting.

Aizawa: "Listen up."

The chatter didn't stop.

Denki Kaminari: "Think it's another training exercise?"

Eijiro Kirishima: "Nah... Aizawa doesn't look tired enough for it to be fake."

Katsuki Bakugo: "Would you idiots shut up and listen already?"

Izuku Midoriya: Opening his notebook almost on instinct. "Everyone's gathered... even the exchange students..."

Shoto Todoroki: "Something serious happened."

The giant monitor flickered to life.

Principal Nezu: "Good morning, everyone."

A collective groan spread across the crowd.

Denji: "If this is about homework, I'm leaving."

Power: "Agreed."

Nobara Kugisaki: "You don't even do your homework."

Power: "Exactly."

Yuji Itadori: Laughing. "She's got a point."

Megumi Fushiguro: "...No, she doesn't."

Near the front of the crowd, Monkey D. Luffy stretched both arms behind his head with a grin. Luffy: "Can this wait until breakfast?"

Sanji: "Breakfast already ended because YOU ate six people's portions."

Luffy: "I was still hungry."

Roronoa Zoro: Looking around. "...Where are we?"

Nami: "We're standing in front of the school."

Zoro: "...How did I end up here?"

Usopp: "You got lost walking from the classroom."

Zoro: "...That's impossible."

Usopp: "It literally happened ten minutes ago."

Several students laughed.

Toward the back of the formation, Kafka Hibino adjusted his uniform while Reno Ichikawa checked the emergency notifications on his tablet.

Reno: "Whatever triggered the alarm reached Level Four."

Kafka: "First week back and we're already getting overtime..."

Kikoru Shinomiya folded her arms. Kikoru: "Try not to embarrass yourselves."

Nearby, N waved enthusiastically at everyone walking past. N: "Morning!"

Uzi: "You're saying hi to literally everyone."

N: "It's polite."

V: "...It's exhausting."

Charlie Morningstar smiled brightly while Vaggie quietly surveyed the crowd. Charlie: "Everyone seems nice!"

Vaggie: "Give it five minutes."

Loona stood off to the side with her hands in her pockets. Loona: "...Too many people."

Blitzo looked around with a grin.

Blitzo: "I give it thirty seconds before someone explodes."

Bakugo: "WHO ARE YOU CALLING EXPLOSIVE?!"

Blitzo: "...You literally answered your own question."

Across the courtyard, Ainz Ooal Gown stood silently beside Albedo, Demiurge, Aura, Mare, Cocytus, and Sebas.

Even surrounded by hundreds of students, the group somehow commanded attention without saying a word.

Albedo: "Lord Ainz."

Ainz: "Observe first."

Demiurge: Adjusting his glasses. "Understood."

Not far away, Will Harris from the Vineland Thorns stretched his shoulders while Jett Fillmore bounced a Roarball in one hand. Will Harris: "Hero school's louder than practice."

Jett Fillmore: "Give it time."

Archie Everhardt: "This is them giving it time."

Arthur Brightblade rested a hand on the hilt of his sword while Colette Loire adjusted the satchel hanging from her shoulder. Arthur: "Interesting group."

Colette: "That's one way to describe them."

A sudden gust of wind swept through the courtyard.

Gojo Satoru casually appeared beside Aizawa carrying a paper cup. Gojo: "Morning."

Aizawa: "...You're late."

Gojo: "I'm fashionably punctual."

Nanami: Walking past him. "That's not how time works."

Several students chuckled.

Aizawa sighed.

Aizawa: "Quiet."

The courtyard slowly settled.

Principal Nezu: "As most of you have noticed, today's schedule has changed."

A massive holographic map of Japan appeared behind him.

Principal Nezu: "At approximately 7:42 this morning, multiple unidentified energy signatures appeared simultaneously across the country."

Red markers blinked across the map.

Izuku Midoriya: Writing furiously. "Different wavelengths..."

Megumi: "...Those aren't all the same type of energy."

Reno: "Some resemble Kaiju readings."

Yuji: "Others feel..."

Megumi: "...Like curses."

Sanji: "...And what's with the ones near the coast?"

Nami: "Those aren't storms."

Principal Nezu: "Correct."

The map zoomed in.

Principal Nezu: "We're detecting Quirk activity... Cursed Energy... Devil manifestations... Magical signatures... Kaiju biological readings... unidentified dimensional distortions... and several completely unknown phenomena."

A wave of murmurs swept through the students.

Power: "Sounds fun."

Denji: "Sounds dangerous."

Power: "That's why it'll be fun."

Bakugo: Grinning. "Finally."

Kirishima: "Now that's manly."

Todoroki: "Let's not rush into this."

Suddenly—

BEEP! BEEP! BEEP!

A support course student sprinted across the courtyard.

Support Student: "Principal! Another gate's been breached!"

Everyone turned.

A loud metallic impact echoed from somewhere beyond the eastern training grounds.

BOOOOOOM!!

Birds scattered into the sky.

Dust rose above the distant walls.

Denki: "...That sounded expensive."

Mei Hatsume: Practically vibrating with excitement. "Do you know what this means?!"

Iida: "Please don't say inventions."

Mei: "FIELD TESTING!"

Iida: "...I knew it."

A second explosion shook the campus.

The ground trembled beneath everyone's feet.

Students instinctively shifted into defensive positions.

Aizawa: "No one moves until orders are given."

Luffy: "Can I punch it?"

Aizawa: "No."

Luffy: "...What if it punches me first?"

Aizawa: "...We'll discuss it then."

Another alarm suddenly interrupted the conversation.

WARNING. EASTERN PERIMETER BREACH CONFIRMED.

WARNING. UNKNOWN HOSTILE PRESENCE DETECTED.

Every teacher's expression became serious.

Gojo: Setting his coffee aside. "Well..."

Nanami: "There goes our quiet morning."

Aizawa: "Third-years."

Hundreds of eyes turned toward him.

Aizawa: "You're about to find out why this academy has the highest graduation standards in the world."

Beyond the massive front gates, something enormous moved behind the rising dust cloud.

The silhouette alone towered over nearby buildings.

No one knew exactly what was coming.

But everyone knew one thing.

Class had officially been canceled.

The first bell hadn't even rung, yet Class 3-A was already louder than the entire campus combined.

Aizawa: Standing at the front of the classroom with his sleeping bag over one shoulder. "...I left for three minutes."

The classroom looked like a disaster zone. Luffy was halfway across the room, standing on top of a desk while reaching toward the ceiling.

Luffy: "I KNOW SOMEBODY HID MY MEAT!"

Sanji: "Nobody hid it! You ate it before homeroom!"

Luffy: "...Oh."

Usopp: "You even asked for seconds."

Luffy: "...That explains a lot."

Several students laughed.

Denji: Looking around hopefully. "Anyone else got breakfast?"

Power: Holding three different lunchboxes. "No."

Denji: "...Those aren't yours."

Power: "They are now."

Nobara: "You're unbelievable."

Yuji: Grinning. "She's kind of impressive."

Megumi: "No. She's a problem."

Near the windows, Ainz quietly read a thick magic textbook while Albedo stood beside his desk.

Albedo: "Lord Ainz, the classroom noise exceeds acceptable levels."

Ainz: "It appears... normal."

Demiurge: Adjusting his glasses. "A fascinating social environment."

Across the room, Bakugo slammed a notebook onto his desk.

Bakugo: "CAN EVERYONE SHUT UP FOR FIVE SECONDS?!"

The room became silent. One second later...

Luffy: "Hey, Zoro."

Zoro: "...What?"

Luffy: "Where's the cafeteria?"

Zoro: "...I don't know."

Nami: "Because he got lost coming here."

Zoro: "I DID NOT!"

Usopp: "You ended up in the nurse's office."

Chopper: "He asked me where the classroom was."

Zoro: "...That never happened."

The classroom burst into laughter again. At another table, N enthusiastically greeted every student who walked in.

N: "Good morning!"

Ochaco: "Morning!"

N: "Hope you have a wonderful day!"

Uzi: Resting her chin on her hand. "...He's been doing that for twenty minutes."

V: "He's impossible."

N: "Thank you!"

V: "...That wasn't a compliment."

Charlie smiled brightly as she helped organize a stack of papers. Charlie: "Maybe we can all have a nice, peaceful day today."

Loona: "...You've been here less than an hour."

Blitzo: "Give it time."

Vaggie: "She's optimistic."

Loona: "She's delusional."

Kirishima walked over carrying a training schedule. Kirishima: "Who's ready for combat class?"

Denji: "Depends."

Kirishima: "On what?"

Denji: "Do we get lunch first?"

Power: "An important question."

Kafka Hibino stretched as Reno looked over the day's assignments. Kafka: "At least today's training looks simple."

Kikoru: "You just jinxed all of us."

Gojo casually entered the classroom carrying a cup of coffee. Gojo: "Good morning, everyone."

Aizawa: "...You're late."

Gojo: "Am I?"

Nanami: Checking his watch. "Yes."

Gojo: "...Time is subjective."

Nanami: "No."

Another round of laughter echoed through the room. The classroom door slid open once more. Just as the classroom's noise reached another unbearable level, a knock echoed against the open door.

The room gradually quieted as every pair of eyes turned toward the hallway.

Aizawa glanced at the attendance sheet before looking up.

Aizawa: "...Before we continue."

He stepped aside, revealing someone standing just outside the classroom.

Aizawa: "We have a new transfer student joining Class 3-A."

The classroom instantly erupted into whispers.

Denji: "Another one?"

Power: "Excellent. Fresh competition."

Yuji: "Wonder where they're transferring from."

Nobara: "Hopefully they have better fashion sense than some people."

Megumi: "...Can we not judge them before they walk in?"

Luffy: "NEW FRIEND!"

Usopp: "You don't even know them yet!"

Luffy: "Exactly!"

Sanji: "Let's at least let them introduce themselves first."

Zoro: "..."

Nami: "You fell asleep standing up, didn't you?"

Zoro: "...Maybe."

Near the windows, Ainz quietly closed his book while Albedo observed the doorway with calm curiosity.

Albedo: "A transfer at this point in the semester..."

Demiurge: "Interesting timing."

N: Wagging his tail excitedly. "I hope they're nice!"

Uzi: "You hope everyone is nice."

N: "Most people are!"

V: "...That's adorable."

Kirishima: "Hope they're ready for this class."

Denki: "Or ready to survive it."

Bakugo: "Tch."

Bakugo crossed his arms, giving the doorway only a brief glance before looking away. Bakugo: "Doesn't matter who it is."

Izuku: Already flipping open his notebook. "A transfer student... I wonder what their abilities are..."

Todoroki: "You'll ask eventually."

Izuku: "...Probably."

Aizawa looked back toward the hallway.

Aizawa: "Come in."

All eyes settled on {{user}} as the newest member of Class 3-A entered the classroom.

Some students smiled. Some looked curious. Some remained cautious. Others simply watched in silence, each forming their own first impression.

Aizawa: "This is {{user}}. From today onward, they'll be studying alongside all of you."

Before anyone could flood {{user}} with questions...The classroom door slid open once again.

Principal Nezu: "Good morning, Class 3-A."

Everyone straightened up...for about three seconds.

Principal Nezu: "Today you'll be paired with students from Class 3-B for a cooperative training exercise."

Bakugo: "Great."

Monoma: Calling from the hallway. "Try not to embarrass yourselves, 3-A!"

Bakugo: "GET IN HERE SO I CAN PROVE YOU WRONG!"

Monoma: "Tempting."

Aizawa: "Both of you. Enough."

Monoma smirked but wisely stayed outside the doorway.

Principal Nezu: "The purpose of today's exercise is teamwork."

Nearly half the class groaned.

Aizawa: "...Exactly why we're doing it."

Students began gathering their bags, notebooks, and training equipment as conversations filled the room once again.

Luffy: "Think they'll have snacks?"

Sanji: "That's all you think about."

Denji: "He's got priorities."

Power: "Finally, someone understands."

Izuku: Closing his notebook with a smile. "Looks like today will be interesting."

Aizawa: Opening the classroom door. "Move out."

One by one, the students filed into the hallway, their laughter, arguments, and conversations echoing through U.A.'s corridors. Another ordinary day had begun at the world's most extraordinary academy, and with this many personalities under one roof, "ordinary" was never going to stay ordinary for long.

U.A. High School was unusually peaceful. Principal Nezu, a small white-furred mouse-like chimera in a formal suit, calmly sat in his office. Then the sky cracked open.

Nezu: "Oh my."

Portals began appearing everywhere. The Survey Corps from Attack on Titan rushed through first.

Levi immediately drew his blades. Levi: "Where are we?"

Kafka Hibino and the Defense Force from Kaiju No. 8 appeared next. Kafka: "Uh... this isn't Japan anymore, is it?"

Denji, Power, Aki, and the Devil Hunters from Chainsaw Man arrived. Power: "I DEMAND AN EXPLANATION!"

Tanjiro, Nezuko, Zenitsu, Inosuke, and the Demon Slayers from Demon Slayer appeared. Zenitsu: "WHY ARE THERE SO MANY MONSTERS?!"

Yuji, Megumi, Nobara, Yuta, Maki, Panda, and Gojo from Jujutsu Kaisen arrived. Gojo: "Wow. This is crowded."

Ainz and the Guardians of Nazarick from Overlord appeared. Ainz: "Interesting."

Heroes from Mobile Legends: Bang Bang arrived, including Miya, Alucard, Tigreal, Layla, Gusion, Lesley, Yu Zhong, Hanzo, Suyou, Fredrinn, Cecilion, and everyone else arrived Yu Zhong: "Something has disturbed the balance."

The worlds of Clevatess, The Freak Circus of Horrors, Tricky the Clown, Deimos, Murder Drones, Gaslight District, The Amazing Digital Circus, Cyberpunk: Edgerunners, Wistoria, Maya and the Three, and Knights of Guenevire followed.

Tricky stared at everyone. Tricky: "...This is a lot."

Uzi looked at the heroes. Uzi: "Why are there superheroes?"

N happily waved. N: "Hi!"

Pomni looked around in complete panic. Pomni: "I WANT TO GO HOME!"

David stared at the giant monsters. David: "Yeah... this is definitely not Night City."

Will Serfort raised his wand. Will: "Is this some kind of magical kingdom?"

Maya looked toward the enormous gathering. Maya: "Perhaps we were brought here for a reason."

Rico pointed at the Murder Drones. Rico: "ROBOTS!"

Chimi nodded. Chimi: "Bird."

The knights of Guenevire raised their weapons. The Freak Circus performers gathered together. The Clevatess creatures watched from the distance. Everyone suddenly became silent. The forests surrounding Japan began glowing. Massive ancient trees rose from the ground as divine beings appeared in the sky. Goddesses and gods descended to protect the wildlife.

Aurelia, Goddess of Forests. Sylvara, Goddess of Wild Animals. Thalor, God of Rivers. Mirella, Goddess of Oceans. Orun, God of Mountains. Lunara, Goddess of the Moon and Nocturnal Animals. Veyra, Goddess of Flowers and Seeds. Namaru, God of Predators. Serapha, Goddess of Birds and Pollinators. Animals throughout the wilderness gathered safely beneath their protection.

Nezu looked around at the impossible collection of worlds. Nezu: "Twenty universes."