The Flap of a Butterfly's Wings

Time: something that means everything and nothing.

Izuku knew this. He knew how important and precious it was. He knew how dangerous it could be.

Yet, he still tries to change it.

Izuku needs to fix his mistakes, no matter the costs. He needs to save everyone from the horrid deaths that had enveloped them. He was a hero, it was his job to save everyone he possibly could. It was his one purpose in this world and he was willing to give his life for it.

So he travels back in time, but it's further back than he thought it would be. That's okay though, because maybe he can maintain his relationship with Kacchan and look after his mom better. Plus he'll have more time to form his plans.

Only, it doesn't go exactly as he planned.

For every different decision he makes, every new leap Izuku takes, another nightmare comes his way.

He swears to save everyone he loves, no matter how many flaps a butterfly may take.

Rankings:
#2 in time travel
#16 in Deku
#2 in vigilante
#2 in anxiety disorder
#3 in Oneforall