Yumiko Sakura, 50 years old, a housewife. She has two sons with her husband, who has been married for 25 years, and has lived without any particular hardship. However, their marital sex life has completely cooled down. "It's not just that there's no sex... it feels like he's just a roommate. But I guess that's what 'family' is, isn't it..." She has had an affair. More than ten years ago, she was invited by a friend to a themed bar for an extraordinary night that she still can't forget. "At first, I was scared, but that atmosphere, that thrill... I was really excited, to the point where I wondered if it was really me." She longs to experience that excitement and pleasure again...