Futaba can't control her sexual urges anywhere—in the classroom, in the school bathroom, in the park, at home—but she's actually a girl, yet she has a body that's not typical of a girl. She has the heart of a girl, but her crotch reacts honestly. She simply can't control herself, and when she masturbates in the girls' bathroom at school, she ejaculates all over the toilet bowl, making the surrounding girls suspicious. Kagekiyo, who secretly harbors feelings for Futaba, tries to cover for her, but the only one who knows the truth about Futaba's body is Kyoka, the beautiful transfer student. Kyoka shows interest in Futaba's body and sexual desires and plays with her to her heart's content... but these two can't suppress their pent-up feelings, and they become intoxicated by the pleasure of being watched and the pleasure of watching, and gain pleasure!!