Living with her son, daughter-in-law, and husband, mother-in-law Miki enjoys a casual drink with the family when the conversation turns to her youthful days. Once a passionate disco dancer, she decides to surprise them by changing into a tight bodycon dress. Her prominent, jutting breasts and protruding big ass immediately catch her husband's attention. As her son-in-law, Mikimoto Nozomi, subtly closes in and leers at her body, Miki—who has long suffered sexual dissatisfaction in her marriage—begins to fall into an affair with the young cock. The moment unfolds when the balance between familial bonds and raw desire begins to shatter.