Ignoring the protests of his working-class mother, a young man becomes wrapped up in the world of delinquents and yakuza.

A coming-of-age story portrayed as the loss of all youthful illusions. Sixteen-year-old Yoichi dreams of becoming a sailor. His parents are fishmongers, and Yoichi lives together with them and his four siblings in cramped living conditions. His beloved younger sister is given to a wealthy, childless uncle; his best friend moves away; the girl he fell in love with from afar is with someone else: little by little, Yoichi loses all the people that are important to him.