Sayaka, a 46-year-old full-time housewife, spends her days indulging in masturbation after her husband leaves for work. One day, her husband comes home early and catches her in the act, leading to a shocking turn of events. Hours later, another man suddenly appears, completely altering Sayaka's ordinary life. The story unfolds as she faces this sudden life-changing moment and the complex emotions that arise within her.