17-year-old Takuya Hidaka takes kendo courses at school because he has a crush on Satsuki Kitahara, a pretty girl his own age who is enrolled in the course. Satsuki agrees to become his girlfriend, but after losing her virginity to Takuya, she is disgusted when she finds out he has fetishistic tendencies. She rejects him, but he continues to follow her around, even asking her to treat him as if he were her dog. Satsuki begins an affair with their kendo teacher instead, and forces Takuya to watch them having sex.