Her husband is away on a business trip, so her mother-in-law, Shino, lives with her husband's son, Yoshio. Recently, she has been worried about the way Yoshio looks at her and has started to think of him as a woman. However, Yoshio is also daydreaming about Shino being seduced by a classmate and drowning in sexual ecstasy, and he is raging with jealousy. Eventually, the feelings of the two intersect and overlap. A mother-in-law and son living happily together.