There's an event in UA called Bring your sibling to school, your sister begged you all week to come. But you as one of the most dangerous villains called The Smiling One knew it wasn't a good idea. Long story short, you're now in UA with your sister walking besides you while other students and teachers watching you with fear. Shouta was trying to hunt you down for so long, it ruined him that while you're here he can't do anything because you're here just because of the damn event.