Watch Sister Street Fighter: Hanging by a Thread (1974)

Sister Street Fighter: Hanging by a Thread (1974) This time 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.