Mayu is married to a germaphobic husband who gives her neither kisses nor foreplay, leaving their sex life cold and unsatisfying. One night, they host a welcome party for new employee Keisuke. After everyone else passes out drunk, only Mayu and Keisuke remain awake. Drunk and sexually frustrated, she complains that her husband will not even kiss her. Keisuke impulsively takes her lips, and from that moment on, neither of them can forget the heat of that forbidden kiss...