Yurika is a married woman who lives with her son. One day, her son, a university student, brings his friends over to the house to help him write a report on his homework. Late at night, the friend witnesses Yurika masturbating in the bedroom and, unable to resist her lewd behavior, rapes her. Even as she is being raped, her body responds to a long-forgotten pleasure, and she becomes intoxicated and unable to resist the climax that comes over her, becoming immersed in pleasure.