Koryu heads to Yokohama in search of a woman named Birei, kidnapped by diamond smugglers who move their hot rocks by surgically implanting them into the nubile buttocks of Chinese prostitutes. Koryu's older sister, working as a jewelry designer, is secretly, if unhappily, involved with the gangsters.

A simple tax collector suffers from a deep depression. He flies from his dominant mother to a dangerous company in violent left-wing circles. And discovers a cure for his impotence.