After ten years of marriage, Ririko discovers that her beloved husband is cheating. Lost in disappointment and emptiness, she reunites with Ozawa, a former coworker whose own marriage is close to divorce. Bonding over their loneliness, the two have an affair, sharing deep, tongue-heavy kisses before eagerly licking and sucking each other's sweat- and arousal-soaked genitals in a steamy 69.