A young mother discovered that her son often masturbated with his underwear

One day, Kaori walks into her son Yuta's room to tell him that dinner is ready, and she witnesses him masturbating furiously while moaning her name. Kaori's mother was very sad, but this made her think a lot and she was happy that her son saw her as a woman. And these feelings trigger the beginning of an affair. The problem is that his grades start to drop… And she stops having sex with him, encouraging him with a special reward, if he manages to get his grades back. This movie includes the first and second parts of the doujin: Boku no Kaa-san de, Boku no Suki na Hito. (僕の母さんで、僕の好きな人).