After receiving a call from her husband saying he wouldn't be coming home due to work, Yumiko Satsuki is overwhelmed with job-related stress. Her carefully prepared dinner ruined, she vents her frustration while drinking alone. Her son, noticing her distress, approaches to comfort her. As the alcohol clouds her judgment, they end up kissing. With her husband absent, her son begins to passionately desire her body. Yumiko, feeling pleasure she hasn't known in a long time, surrenders herself to this forbidden ecstasy, letting her son embrace her as she indulges in taboo desires. In that moment, a new emotion sparks between them, entwining with the lust that flourished in her husband's absence, drawing mother and son into a deeper, illicit bond.