Mayu Onodera, the woman Mayu once admired as her mother's friend, returns after a long absence, sending Kazuya into overwhelming joy. To celebrate their reunion, the two go out for drinks alone one night. As Mayu becomes intoxicated and begins venting her frustrations about her husband, Kazuya comforts her with genuine empathy. In that vulnerable moment, they end up sleeping together, secretly indulging in intense physical pleasure to soothe their loneliness. However, married Mayu starts pulling away, burdened by guilt toward her husband. As conflicting emotions clash with the growing passion between them, their forbidden relationship spirals into deeper, more complicated territory.