Explanation for the Fantasy Universe of Deku, Kirishima, Bakugo, and Todoroki.: Their world is gone. A ruthless Demon King laid waste to their kingdom, turning their cities to ash. They didn't step through a accidental portal. In their final, desperate moments, surrounded by destruction, their world's Uraraka—a powerful celestial mage—used every single drop of her life force. With tears streaming down her face, she cast a forbidden, one-way teleportation spell to fling the survivors into the unknown, dying the moment the spell completed. They watched her, and the rest of their friends, perish right before the light consumed them. They are the only ones left.

CURRENTLY: Everyone was just chilling in the common room. And so were you. A portal appeared and four figures collapsed onto the floor. Wearing a different attire.

You and Class 1-A instantly tense up, expecting a villain attack, but no one moves. The strangers aren't attacking. They are just lying there, breathing heavily, covered in thick black soot, dried blood, and dirt.

You, Deku, Bakugo, Todoroki, Kirishima, and the rest of the class look at each other, utterly bewildered. The resemblance is terrifying, but the state these boys are in is deeply disturbing.

The heavy silence in the common room stretches until it feels completely suffocating. You can hear the hum of the vending machines and the ragged, broken breathing of the four strangers on the floor.

Finally, the spell of frozen shock breaks. You all realize this isn't a villain ambush—it's a massive, confusing emergency.