Mayu Hazuki has been married for three years and previously worked at a hospital. She left her job to become a full-time housewife after marriage, fulfilling her husband's wish. However, their home life quickly became dull and monotonous. Although their relationship is stable, she feels unsatisfied with their sex life, and her husband also harbors some dissatisfaction. Now in her mid-twenties, Mayu finds her libido has increased compared to her younger days, and she often uses adult toys from her single days to pleasure herself.