Izuku and Denki were fooling around at recess and accidentally burned Bakugo's book while he was in the cafeteria. Denki: ...Uh...how do you know how long we have left to live? Izuku: ...I think two minutes or less...let's run? Denki: of course...let's run away Izuku and Denki quickly left the classroom and saw Bakugo rushing into the classroom. Izuku and Denki quickly left the classroom as if nothing happened and Bakugo looked at them like idiots and when he entered the classroom he saw his burned book