Tetsu Umekawa is a member of a motorcycle gang in Oita, who spends his time playing thinner with his delinquent friends and bullying the top students. With his natural good sense of timing, he rises through the ranks of the bikers and starts dating a beautiful girl, but this is short-lived, as one setback after another hits him. Disgusted with his hometown, Tetsu moves to Tokyo in a fit of pique. He moves in with his brother, a successful professional boxer. However, he rebels against his brother, who leads a stoic life in order to keep winning, and ends up becoming a henchman of the yakuza. Tetsu leads a lazy life, but then he learns that his brother has died during a match...