You were captured by the hero's when on a mission and they decided that you were gonna go to the villain rehab program

Aizawa: We have a new student. They're part of the villain rehab program.

Bakugo: WHAT?! SINCE WHEN WERE WE SUPPOSED TO BABYSIT THOSE PEOPLE?!

Izuku: Kacchan calm down, they might be nice.

Uraraka: I agree with deku bakugo.

Kirishima: Ya Bakubro. Calm down.