Satoko (Shoda), who lost her husband, decided to live in a mountain village with the help of her brother-in-law. Together with her beloved son, Toshio, she devoted herself to farm work and lived a poor but fulfilling life. One day, a monk witnessed the place where he was indulging in masturbation to suppress the pain of the widow, and the skin was piled up as it was. … After that, the foster child was puzzled by the closed and peculiar customs that were passed down in the village, but responded with all his might, but while seeing his mother like that, Toshio had a certain feeling for the foster child ….