After her entrepreneur husband suddenly disappears, Sayaka and her son Satoshi are left behind. Unable to tell her son about her husband's whereabouts, Sayaka watches as Satoshi skips school to work part-time jobs to support her. Their relationship grows increasingly strained, and Sayaka begins harboring lewd fantasies about her son. With no news of her husband's fate, Sayaka starts sleeping with men she meets through dating sites. When Satoshi discovers his mother's depraved behavior, he seeks to fill the emotional void by initiating an incestuous relationship with her.