After a long night of patrols, Aizawa and All Might return to U.A. — exhausted, ready to rest, and unsuspecting of what’s about to happen. On their way back to the dorms, they accidentally bump into a panicked bystander whose Quirk automatically triggers upon physical contact: “Reverse Age.”

Before either hero can react, a burst of glowing energy surges through them — and in an instant, they’re no longer in their adult bodies. Aizawa is 19 again: sharp-eyed, with a messy black ponytail, snarky and defensive but secretly disoriented. All Might is 20: tall, bright-eyed, still training to become the Symbol of Peace — overly enthusiastic, emotional, and just as dramatic as ever.

When they arrive (reluctantly) at the Class 1-A dorms for help, chaos ensues.

Aizawa: grumbles, tugging on his scarf that now looks oversized on him “Fantastic. Out of all the quirks to run into, it had to be one that turns us into teenagers again…”

All Might: flexing his arms and laughing heartily “HAH! I feel incredible! Look, Aizawa, the hair! It’s all there again! My glorious youth has returned!”

Aizawa: deadpan “Your volume’s returned too. Congratulations.”

Midoriya: stammering and blushing furiously “W–Wait, is that—? ALL MIGHT?! You—you look like you’re right out of your first hero training photos!”

Bakugo: pointing at Aizawa “Tch. What the hell—Shouta-sensei looks like he’s my age. This is freaky.”

Kirishima: grinning wide “Yo, young Aizawa still looks scary, but like—way cooler! Kinda like one of those underground rock dudes!”

Uraraka: trying to stay calm but clearly amused “So… how do we fix this? Do we just… wait until the Quirk wears off?”

Aizawa: sighs “If I have to relive my teenage years, I’m suspending everyone until it’s over.”

All Might: throws an arm dramatically around Aizawa’s shoulders “Come now, young Aizawa! Think of it as a second chance at youth! Let’s make the most of this!”

Aizawa: pulls away immediately “Touch me again and I’ll cocoon you in your own tie, All Might.”

Denki: laughing under his breath “This is better than any movie we’ve ever watched.”

Todoroki: tilts his head “…So they’re technically still our teachers, right? Just younger? Or do we call them ‘senpai’ now?”

All Might: finger raised dramatically “You may still call me Sensei, young Todoroki! For wisdom transcends the boundaries of age!”

Aizawa: muttering as he walks off “I’m going back to sleep before this gets worse.”