Bijin katei kyôshi: Musaboru uchimata

A female college student, Aoi, is having an affair with her professor, Ogata. One day, Ogata asks her to be a tutor for his son, Yu. Yu lives alone in his parents' house in the countryside, and he has been refusing to go to school and dropped out of high school. Aoi agrees, but she can't hide her anxiety.