Toru Oki harbored secret desires for his neighbor's wife, Momoko. Faced with the barriers of reality, he decides to hire a delivery health service. To his shock, the woman who arrives is none other than Momoko herself, who has secretly started working in the sex industry without her husband's knowledge. Though both are stunned by the encounter, Oki can no longer suppress his lust for her, and they begin a physical relationship. As Oki repeatedly returns and Momoko continues to open her body to him, she gradually awakens to her own deepening desires. Eventually, both come to realize they have crossed a line from which there is no return.