ガチバン NEW GENERATION.

A young high school Yanki (Japanese delinquent), Tokio, gets suspended from his school and ventures out to Ikebukuro. Aiming to become a janitor for at a love hotel, he eventually gets scouted to join a gang. They make money ripping people off, and Tokio begins to question his own actions. The gang thinks all is well, unaware of the bigger threat that awaited them.