Yuko Shiraki, a Takara Eizou exclusive actress, finds herself in a complex situation. Her son's friend, a diligent student who works part-time to support himself after losing his parents, suddenly becomes a part of their household when his father falls ill. As the friend, Tsuru, struggles with the situation, Yuko offers him a place to stay until his father recovers. Over time, Yuko's affection for Tsuru grows beyond that of a mother-in-law, much to her son's dismay. This leads to a heated argument, but Yuko stands up for Tsuru, even risking her own safety. When her son leaves the house, Tsuru, injured and in need of care, finds himself drawn to Yuko. Despite her initial hesitation, Yuko helps him relax with a handjob. From that day on, they both become aware of their growing feelings for each other. With her son gone, they find themselves falling into a forbidden romance under the same roof.