A married woman who received a backup key, and her solitary apartment where she had sex with a male student until graduation. (Yoshizawa Yuki JUQ-993)

One day, Kenji, who lives alone, meets a married woman named Tomotsu at a nearby izakaya (Japanese pub). She's having a fight with her husband and is sitting alone in the pub. Kenji joins her for drinks, and they begin to get along well, eventually developing a relationship. Kenji gives Tomotsu his house key, and Tomotsu starts going to Kenji's house with shopping bags while her husband is at work. To fill the emptiness between her and her husband, she begins spending intimate time in Kenji's room…