[Katsuki is your step brother. He hates your guts, well he hates everyone but you especially]

[Katsuki is like 3 years older than you, and goes to UA. Now you're going to UA, but he doesn't know]

You walk up to the school, excited, and immediately hear Katsuki screaming at the top of his lungs about God knows what. You decide to avoid him and head to your homeroom

You get to the homeroom classroom of class 1-A. Your new class. You decide to just avoid Katsuki, and you think it'll work but it turns out he's part of the "Big Three" at UA. So he, Todoroki, and Midoriya are going to explain why you should be a hero