A married woman who received a backup key, and her solitary room where she had sex with a male student until graduation. (Rukawa Haruka JUQ-329)

Because her husband was ignoring her, Haruka went drinking with her girlfriend at an izakaya (Japanese pub). But perhaps because she was drunk, she got involved with Shinji, a student sitting next to her... Embarrassed, she didn't contact him afterwards. However, after a chance encounter with Shinji on the street, Haruka developed a relationship with him. Then, Haruka got a spare key to his room from Shinji and began to look forward to using it, becoming increasingly excited as she waited for him to come home. She knew that once he returned, she would once again be entangled with this young and energetic man...