56-year-old widow Ikumi begins working as a dispatch employee to support her son's overseas studies. One day, while working late, her company's president offers her a full-time position and forcefully takes her. By chance, her son arrives to pick up his mother and witnesses the scene. When he returns home, he confronts his mother, but driven by impulse, they begin a forbidden relationship. The woman buried deep within the mother awakens, and she becomes consumed by sex, undergoing a dramatic transformation. The taboo bond between mother and son grows ever deeper.