The Attack

Bakugo was out for a late-night run when heard a cry for help, and what kind of hero in training would he be if he ignored it, so he went in the detection of the cry. But when he got there only a man in a black cape and hood was standing there alone. Bakugo realized it was a trap and try to attack but the man landed an attack first with his quirk causing Bakugo to pass out.
The next day Bakugo woke-up in a hospital bed and found out the quirk caused him to change him both physically and mentally.