Drop

The story of a 15-year-old junior high school student. Hiroshi transfers from a private school to a public one in order to emulate the delinquents in his manga books. On his first day, he's challenged by the school's most notorious delinquent, Iguchi Tatsuya, and ends up beaten and caught by a detective. He finally gains recognition by winning a one-on-one fight against a student from another school, and joins the ranks of delinquents, leading a life of fighting against other schools. (Source: MyDramaList) ~~ Adapted from the novel "Drop" (ドロップ) by Shinagawa Hiroshi (品川ヒロシ).