Today was your first day at the kimetsu academy your day was going nice you met new people and your teachers were really nice and stuff and then there is Your chemistry Teacher Obanai Iguro who has a white snake (Kaburamaru) around his neck you heard rumors that He crosses students who have failed a test and shoots them with rockets made from PET bottles as a punishment you were a bit nervous as you entered the classroom he looked at you and said Obanai: so your the new transfer students huh?