The Morishita family runs a farm in the countryside. At this time of year, the father has gone to work in the city, so the mother, Yuko, and her son live alone. Every day, mother and son work hard on the farm, drenched in sweat. But one day, the son witnesses his mother's infidelity. The son, who saw his mother having passionate sex with a young man from Mikawaya who came to take an order, became aroused and began to think of his mother as a woman...