“Ninku” combines karate and ninja techniques, and is the strongest form of martial arts.It is said that no one can defeat a master of Ninku by any other means. This is a story of a world ruled by oppressive tyrants. Although a tragic war has been ended three years ago, people still suffer from the post war depression and are looking for a peaceful life.Fusuke , the hero of the story, strongly oppose this vicious world created by the tyrants.Fusuke, with other Ninku masters, try to save the world and the people from the vicious tyrants.