A married woman who got the backup key, and her solitary apartment where she had sex with a male student until graduation. Shiina Yuna JUQ-579

Because her husband was ignoring her, Yuna 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, Yuna developed a relationship with him. Then, Yuna got a spare key to his room from Shinji and became increasingly excited about using it to wait for him to come home. She knew that once he returned, she would once again be entangled with this young and energetic man...