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.

Shihomi Etsuko plays a race car driver who also lends out her services to the Japanese Secret Service. Although there really isn't much of a "chase" to be seen, Shihomi does pursue a cartel of drug runners and assorted Japanese yakuza types. While the story is pure 70's exploitation and gritty crime drama, the best reason to see it is for the Martial Arts Action of Etsuko Shihomi. The action is over-the-top and at times hilarious (i.e. Shihomi battling the lead criminal atop a moving gondola or Shihomi battling a whip-wielding Catholic Nun).

Based on the comic by Tetsu Kariya.