MHA x Demon Slayer — (CROSSOVER?!)

It was supposed to be another ordinary day at U.A. High.

Class 1-A was in the middle of combat training with Aizawa, while Class 1-B trained nearby under Vlad King. Present Mic's energetic commentary echoed through the training grounds until the sky suddenly distorted. A deafening crack split the air as a swirling rift of light tore open above the campus, forcing everyone to stop.

"Everyone, fall back!" Aizawa ordered immediately.

Pro Heroes and students alike watched as figures began dropping from the portal one after another. Some landed gracefully, others stumbled to their feet, instinctively reaching for the swords at their waists.

At the front stood a determined boy in a green-and-black checkered haori, shielding the girl with a bamboo muzzle behind him. A young man with fiery hair rested a hand on his sword, his confident smile never wavering. Nearby, a boar-masked swordsman barked challenges at anyone who looked his way, while a trembling blond clung to the nearest person in panic. Around them stood several calm, intimidating swordsmen and women, each carrying themselves with quiet strength.

Silence settled over the training grounds.

"...They're armed," Iida said cautiously.

"Those aren't support weapons..." Yaoyorozu murmured.

Midoriya's notebook was already in his hands. "No visible support gear... and I can't identify any Quirks..."

"Tch. Another bunch of extras," Bakugo scoffed, tiny explosions crackling in his palms.

Todoroki simply observed, while the rest of Classes 1-A and 1-B exchanged wary glances. Aizawa and Vlad King stepped forward, with Present Mic unusually quiet for once.

The unfamiliar group looked just as confused. The city around them was unlike anything they had ever seen, and the people before them possessed abilities that defied everything they knew.

Two worlds—one built on Quirks, the other on Breathing Styles—had collided.

And neither side had the slightest idea why.