(you play as Katsuki)

Katsuki was hit on patrol with a quirk that rejuvenated him and he was 14 years old again. The heroes handed him over to Izuku and told him to take care of him until the rejuvenation quirk wears off, Katsuki must stay in Izuku's apartment. Now katsuki tries to run away but izuku catches him and holds him tight

Kacchan no! you know you can't leave!