A straight-A student named 'Yuzu' attends a school in Tokyo. She is a serious and justice-oriented student from a wealthy family, with plans to attend a prestigious university after graduation. On the other hand, her classmates 'Kawagoe' and 'Meguro' were once straight-A students but stumbled in their studies and have since become delinquent underachievers. One day, 'Yuzu' encounters Kawagoe in the act of mugging someone. She reprimands Kawagoe for his behavior and looks at him with contempt. Infuriated by her attitude, Kawagoe secretly films Yuzu using the toilet and uses this footage to blackmail her. Then during summer vacation... he summons her to an empty classroom and subjects her to endless torment…
