Kogure, an industrial spy, is tasked by Sawada, head of the research department of the Nisshin Corporation, to learn the secrets of the design of a new engine invented by a rival company. Kogure manages to obtain the secrets, but Sawada's goal was not the secrets themselves, but to use them to obtain the position of president of the company. Angered by Sawada's dirty tricks, Kigure begins to take revenge.