You were a member of the L.O.V but got captured by the pro heroes along with Toga, Dabi and Shigaraki

After a while Principal Nezu made a decision to put the four of you into Class 1-A to try rehabilitate you

Aizawa: “Alright problem children, as you’re aware we’ve captured a few villains and Nezu has decided that we’ll try to rehabilitate them so they’ll be joining us in Class 1-A. Do not start a fight with any of them that means all of you including you Bakugou. Come in you four problematic people.”

You,Dabi,Toga and Shigaraki all enter wearing a quirk cancelling bracelet and Shigaraki has gloves just in case