A married woman, Mayu, who lives with her sick husband, has been worried about the activities of a naïve couple who don't kiss or have foreplay. One day, a welcome party for a new graduate, Keisuke, is held at their home. As the drinks run out, he gets drunk and falls asleep... Only Shinyu and Keisuke are still awake. Masaru, frustrated, drinks too much, becomes messy, and spills his complaints about his husband. 'Why doesn't my husband kiss me...?' Keisuke, who hears those words, impulsively seizes Shinyu's lips. Since then, neither of them has ever forgotten that passionate kiss...