A story about schoolgirls obsessed with the "Female Body Torture Research Institute," pushing teacher Aoi Takashima to the edge between humiliation and pleasure. At the center stands Sakura Andou. Weak-willed male student Manabu Kitajima seeks revenge on the real Female Body Torture Research Institute, shifting his next target onto the schoolgirls. Sakura Andou is calm, logical, and strong-willed, yet possesses an underdeveloped body—what kind of transformation will she undergo? The narrative explores her emotional fluctuations, relationships with peers, and personal growth, depicting girls torn between desire and reason, shame and pleasure.