Kayo lost her husband at an early age and lives with her son. The mother was always kind and loving, and the son eventually came to love her more than a mother and son. The son gets a job and is leaving home. To make a final memory, the two go on a trip to a hot spring together. The son approaches his mother, whom he has fallen in love with as a woman. With their lips pressed together and her breasts squeezed, Kayo resists at first, but before she knows it, she is consumed by the pleasure of being a woman. Unable to stop enjoying the forbidden pleasure, the two make love again and again in this forbidden tale of incestuous immorality.
