"Why is my wife's handkerchief in this room...?" A secret affair story where I witnessed my wife getting obsessed with my student at the hotel where I work as a cleaner Rio Kuriyama

The movie revolves around a secret affair between Ryo's wife and her former teacher, Ken Matsumoto. The story unfolds with Ryo discovering his wife's infidelity through a handkerchief found in a hotel room where he works as a cleaner. As the plot progresses, it becomes clear that the wife is seeking excitement outside of her marriage, while Ryo struggles with his own marital issues, including his inability to engage in sexual activities due to a back injury. The central dramatic tension lies in the exploration of themes such as marital dissatisfaction, secrecy, and the pursuit of forbidden desires.