Yui worries that "I feel like someone is watching me do obscene acts." In fact, Yui is raped by her husband's father on a daily basis, and she thinks that this is the cause. However, one day, when she goes to see a psychiatrist, she is diagnosed with a type of obsessive-compulsive disorder, and is told that "accepting everything is the first step to improvement." She undergoes "hypnotherapy," in which she surrenders herself to the doctor, but there is no improvement. When Yui returns to see the doctor, the doctor tells her, "The next time you feel an obsession, invite the person watching you. If you do, your pathological habit will become apparent." When she returns home, Yui follows the doctor's advice and masturbates provocatively in the direction of the person she feels being watched, but...