Reika visits her son Kazuya's boarding house in Tokyo after he moves there for college. Kazuya quickly leaves for work, leaving Reika alone with his roommates, Hatanaka and Kashiwagi, who invite her to dinner. Drawn to her warmth and maternal charm, the men become aroused and, fueled by alcohol, overpower her. Overcome by pleasure she hasn't felt in years, Reika loses control and surrenders to them. Enthralled by the reckless, intense sex with the young men, she begins grinding her hips on her own, chasing ecstasy. The events of that night become an unforgettable experience for her.