Osu!! Karate Bu

A high school in Osaka, known for its high number of delinquents, is home to a karate club with a reputation as the most violent group on campus. A first-year student joins the club in hopes of defending himself from harassment, only to become involved in its intense environment. The narrative centers on the club's captain, a prominent figure in Osaka's underworld, who faces challenges in safeguarding both the club and the city.