Yui Kitajima, who attends a school in Tokyo, is a leader with a good personality and a strong sense of justice. She accepts a part-time job at an event at the request of her friend Reiko, but it turns out to be a horrible trap: she has to appear in a female orgasm show. An innocent girl is tied up, her private parts exposed, and she climaxes over and over again. The worst time of her life, filled with humiliation and shame, begins.