A local city near Tokyo. A diligent student named 'Sakura' attends a certain school there. She is a serious student with a strong sense of justice. Her family is wealthy, she excels in her studies, and she is set to attend a prestigious university after graduation. On the other hand, her classmates 'Suzuki' and 'Kawagoe' were once excellent students but stumbled in their academics and have since become delinquent underachievers. One day, Sakura reprimands Suzuki and Kawagoe for their behavior in the school corridor, looking down on them with disdain. This attitude makes Suzuki and Kawagoe tremble with anger and hatred. Then comes the summer vacation... The two delinquents summon Sakura to an empty classroom and subject her to 20 days of endless torment.
