Takashi and four of his classmates, fourth-grade students, cannot succeed in doing a back pullover around a horizontal bar. Their gym teacher warns them: they have one week to succeed; if they resign now, then, tomorrow, facing life difficulties, they will always run away and become bums. Furthermore, all five must succeed, if one of them cannot do it, then all of them fail. Takashi is really worried and wonders if he won't be always the loser who couldn't succeed in the back pullover bar exercise.

Paul Racine, a high-powered American business executive in Japan, is catapulted into a maze of danger and intrigue after he and his sexy companion are the targets of assassins hired by the ruthless Kinjo. To survive, Racine must join forces with a powerful samurai and together they will fight the force of evil in an awesome battle rooted in centuries of brutal conflict.