Former boxer Goro Kawasaki was attacked by the organizer of the fights for knocking out his opponent because he could not stand the fight. He is being released from prison, where he was imprisoned on charges of causing bodily harm. He meets his younger brother Fumio, who is going to become a boxer and dreams of owning his own car repair shop. Goro tries to help Fumio, but is refused. At this time, the boss of the underworld, whom Goro met in prison, is released, and this escalates into a confrontation involving Goro and Fumio.