In the last summer of his middle-school life, he decides to become a delinquent. He leaves his prestigious private school and "drops out" to start leading a life as a delinquent. Now he is a member of the gang that rules Komae Kita Middle School, hiding the fact that he is an amateur at being a delinquent. He stays and fights together with Iguchi Tatsuya, a leader of a gang and a delinquent who Hiroshi aims to be like.