Nakayama Aya is a 32-year-old housewife who has been happily married for two years. To others, Aya and her husband seem like a perfect couple. Aya notices a message from a mysterious woman on her husband’s cellphone, leaving her to wonder if he might be having an affair. She then remembers that they have not been intimate in the past two months. Aya begins her search in earnest for additional evidence of a potential affair.
Yoshino Michi is 32 years old. She's been married for five years, but hasn't had sex for the last two. It's not as if she doesn't get along with her husband, it's just that the sex part is lacking. It was a bit unexpected, but one night when she when drinking with her colleague, Niina Makoto, she wound up confessing that her marriage had turned sexless. And then, a shocked Niina responded "My marriage is sexless, too," and smiled with a lonely look in his eyes.
Kanzaki Miwa is married to Kanzaki Hiroki and is a full-time housewife. She used to work for a large company but made the difficult decision to quit her job and become a full-time housewife in hopes of having a child. But her marriage life isn't going very well as her love for her husband has cooled considerably. Hiroki acts like an ideal husband when around others, but he speaks harsh words to her when they are alone. She lives her days like a bird in a cage. One day, Miwa meets her childhood friend Fuyutsuki Ryo, whom she hasn't seen in years. Back then, Ryo was like a hero to her and loved by her. When she was in trouble, he always came and helped her. They make the fateful decision to spend the night together, and Miwa later finds out that she is pregnant with his child. She doesn't want to divorce her husband and become a single mom because she doesn't have a job. To protect her baby, she decides to tell her husband that she is pregnant with his child.
A man and a woman meet for the first time. The handsome stranger, asked her to spend one day with him. The woman has never taken a dangerous risk in her life. She has been with her lover for seven years and is going to get married next month. For the first time she will experience a level of excitement and intimacy, she has never experienced before with the man she met only today.
