Yuzu is an honor student at a school in Tokyo, and is a serious student with a strong sense of justice. She comes from a wealthy family, is good at studying, and plans to go on to a famous university after graduation. On the other hand, her classmates Kawagoe and Meguro were once honor students, but they stumbled in their studies and have now become poor students with bad behavior. One day, Yuzu comes across Kawagoe mugging someone. Yuzu scolds Kawagoe for his behavior and looks at him with contempt. Angered by this attitude, Kawagoe takes a secret photo of Yuzu defecating and uses it to threaten her. Then during summer vacation, he calls Yuzu into an empty classroom and violates her endlessly...