Miho, who married and had a child at a young age, gradually became sexless. When her son became a college student, she discovered her husband's infidelity. While living separately from her husband with divorce in mind, her son returned home for summer vacation. On a trip to a hot spring with her son, who confessed his love for his mother, Miho's heart was touched by her son's kindness, more so than by her unfeeling husband. Despite knowing it was wrong, the conflict between her maternal guilt and her feminine pleasure intensifies. Deep in the mountains, at a small inn, the mother and son forget themselves and become entangled in an incestuous affair... A tale of forbidden love between a mother and son!
