It's been three months since Misa's mother-in-law passed away. Worried about her father-in-law, who lives alone, the Makise couple decide to move to Misa's parents' house. However, her husband is often away on business trips and is rarely home, so they haven't had sex for a long time. Furthermore, living alone with her father-in-law unconsciously makes her feel tense... Due to this stress and frustration, Misa has gotten into the habit of masturbating after finishing her housework. However, her father-in-law happens to find out about this and can't help himself, so he sneaks into Misa's bed while she sleeps alone...