The night before her husband leaves for a new job, Hisayo and her husband have foreplay in the bathroom, and then have a nettlesome sex in the bedroom. One day, she comes home to her boy's house, where she is taking care of him, and masturbates. Her boy peeks in on her. She sucks his erect penis without thinking. The next morning, unable to resist, she sneaks into his room and has a forbidden relationship with him.