Gentaro Nakajima

Inventor Goro Ibuki creates a humanoid robot named Jet Jaguar. It is soon seized by an undersea race of people called the Seatopians. Using Jet Jaguar as a guide, the Seatopians send Megalon as vengeance for the nuclear tests that have devastated their society.

Tobimaru is the young emperor of Japan. He meets a mysterious woman named Tomamo. After successfully seducing Tobimaru, she brings great misfortune onto the land. Tobimaru soon discovers that Tomamo is actually a kitsune, and now has the task to unmask and kill her to save his land.