Hisayo, who divorced her husband 10 years ago, lives with her daughter, Yuki. Yuki has a new boyfriend named Ryo, and brings him home. Hisayo welcomes him, but when she sees Ryo and Yuki entangled, she becomes excited and masturbates. Later, when she is alone with Ryo at home without Yuki, Hisayo forcibly kisses Ryo to satisfy her desires, and then...