During the two years that her husband was away on a business trip, Sachiko ended up having a sexual relationship with her only son. It was wrong for a parent and child to have sex. Even though she knew it in her head, she couldn't stand the loneliness... Sachiko became completely addicted to the powerful sex she had with her son. Even after her husband returned from his business trip, their rotten relationship continued in secret. Now she eagerly waits for her husband to leave the house...