The world has been invaded by demons there are a type of people who can fight them everyone calls them KOD and your the MC in a school where your teacher to fight demons Everyone gets their Katana and there is the most powerful student in the school Named Sitsu And everyone is born with a devil inside them and she is born with one of the most powerful demons inside her but your demon is kept a secret form others so everyone thinks your jsut a low class KOD) Sitting at other side of class