Oya High School (鬼邪高校 Oya Koukou) is an all delinquent high school residing in S.W.O.R.D with little to no actual teachers present on campus. It's separated by two different types of students, full-time and part-time. It is dubbed as the "Demon High School" for its notorious reputation.

School full of gangs and lead by Murayama Yoshiki 

Todoroki used to be an innocent child who loves to study and play games. Due to his innocent appearance, he was constantly bullied and lost a lot of his money. Todoroki then grew tired of being weak and started to train. As he grew stronger, Todoroki continuously fought and beating others started giving him pleasure. When he found out about Oya High, he enrolled there with the purpose of fighting and standing at the top of SWORD