A sex movie of Sumire Mizukawa and Saito, a ronin (students who failed the university entrance exam and are about to retake it). His neighbor is Sumire, a beautiful, kind woman who always helps and cooks for him. Saito has had a crush on Sumire for a long time, but she is currently living happily with her husband, so he has no other intentions. Because the wall is quite thin, every time Sumire and her husband make love, Saito can hear everything clearly, making him even more jealous of Sumire’s husband. During the following time, he always thinks about Sumire, and whenever he has free time, he masturbates while thinking about her. One day, while he is in his room, he hears Sumire scream. He rushes out, but Sumire suddenly rushes in and hugs him. It turns out that there are cockroaches in her house. Saito is about to go back, but Sumire asks him to go inside and help her get rid of them. While looking for cockroaches, Sumire kept showing her round butt to him, her panties completely exposed, making Saito unable to resist anymore. He immediately spoke his mind, saying he wanted to have sex with her. Hearing Sumire’s answer, Saito couldn’t believe his ears. She agreed to have sex with him! And their illicit relationship began from there. Whenever Saito felt “craving for sex”, Sumire would come to “take care of it” for him so he could study in peace…