There is a family of ninjas who served the Tonoyama family for generations. That family is the Kashizuki. In the present day, a high school student named Tonoyama Wataru has a beautiful kunoichi named Kashizuki Kikyo, who has been by his side for a long time as his bodyguard. Tonoyama Wataru loves NTR fantasies, and Kikyo often becomes the victim of his erot*c delusions. Not only Kikyo, but her sisters also fall victim to those delusions.