Sixteen-year-old high school student Takeshi Chimatsuri has dedicated his life to becoming a master samurai, just like his father was. But one day, the Toki twins—two ninja sisters he has known since childhood—transfer to his school and challenge him to reclaim their family dagger from him. Unfortunately for him, they have uncovered his one weakness: a fear of the naked female body. Now, Takeshi must undergo special training from his classmates Atsuko and Torai, as well as his teacher Miss Ayatsugi, in order to resist the combined brute strength of Akari and the seduction of her sex-crazed twin sister Kagiri. Class will never be in order with these three constantly at odds with each other.