Chie is worried about her daughter's lack of interest in studying, so she asks Ryuji, who has entered a prestigious university, to help her. Her daughter is only interested in her relationship with Ryuji, not studying. Chie, who hasn't had sex with her husband recently, accidentally finds out about her daughter's relationship with Ryuji. Chie then asks Ryuji to have sex with her to help her daughter's studies.