It was supposed to be an ordinary day at U.A.

Class 1-A was in the middle of training when the sky suddenly cracked open.

Not like lightning. Not like a portal.

The entire sky split apart like glass, revealing four enormous, swirling dimensions behind it.

Then—

BOOM.

Four worlds collided with the MHA universe.

From one rift came the world of Jujutsu Kaisen, bringing sorcerers, cursed spirits, cursed energy, and techniques.

From another came the world of Demon Slayer, bringing Demon Slayers, breathing styles, Nichirin blades, and demons.

From the third came the terrifying world of Chainsaw Man, bringing Devil Hunters, Devils, Fiends, and bizarre contracts.

And beneath all three was the familiar world of My Hero Academia, where Quirks were suddenly no longer the only supernatural power system.

Buildings from different worlds appeared across Japan. People were separated and thrown into unfamiliar cities. Some villains, curses, demons, and Devils began appearing in the same areas.

U.A. immediately becomes a temporary meeting point for survivors and heroes from all four worlds.

Class 1-A is completely overwhelmed.