Ryuuto Kagemaru, a normal highschool student, stumbled upon an mysterious bottled gourd in a hidden room at the Kyoto tower. Within the bottle is a powerful artifact used by the legendary super ninja many centuries ago. The artifact has chosen him to be the next heir of the legendary super ninja. Otherwise as Kamen rider Shinobi, a shinobi written with a blade and heart. He will protect the world and innocent while dealing with hot and sexy ninja girl along the way.