Umi (Shiokawa Undan) is a housewife living an ordinary life with her husband. However, she is not satisfied with her sex life with her husband and repeatedly masturbates with a rope. One day, her husband brings home a new employee who has changed jobs. The older man, who joined the company after retiring from his previous job, accidentally witnesses her masturbating. He forces himself on her and rapes her. However, Umi is not completely opposed to it and starts begging him to continue to rape her...