Recently, Rin is dissatisfied with her boyfriend's sex life, which has become stale. She suspects that her boyfriend is cheating on her. Rin consults her boyfriend's father about the affair. However, as she talks, she begins to have feelings that she shouldn't have for a grown man with a wealth of life experience. Rin seduces her father herself , and her fair, slim body writhes as she climaxes repeatedly with her father's skilled techniques and toy attacks.