Chihiro lives with her husband, an elite company employee, her brother-in-law, and her parents. On a midsummer night, Chihiro is sweating and struggling to sleep in a house with a broken air conditioner, and her brother-in-law, Kojiro, peeks in on her. Unable to find a job and being compared to his brother, Kojiro is frustrated by his days of being compared to his brother, and in the midst of this, he turns his lustful eyes towards his sister-in-law, Chihiro. He then rapes Chihiro when his family isn't looking. When her husband goes on a business trip, Kojiro loses control and they engage in intense, sweaty sex.