Sugimoto, a junior at the company that her husband loved, finished working at the branch and was assigned to the head office, where she started working alongside her husband. The two of them take care of Sugimoto, who is single and lives alone, by inviting them over to their house. One day, Sugimoto, unable to control her lewd urges, approaches Yuko, and the two end up having a relationship. Yuuko, who was aware of her poor sex life after her sister-in-law pointed it out to her, decided to marry her husband even though she knew it was wrong.