She has been married for two years and lives a peaceful life with her husband. Then she sees her uncle for the first time in a decade at a family memorial, bringing back memories she tried to bury—during her days as an adult student, he trained her with bondage. “I'm a bad girl because I still can't forget being a masochist. Please punish me. Train me again...” The taboo relationship with her uncle and the crushing guilt only make her crave it more.