The protagonist, Taichi, and his wife, Miwa, are newlyweds who married as a result of a workplace romance. As they were both raised by strict parents, they hit it off because of their similarities in their childhood circumstances. After two years of dating, they end up getting married.

One day, Taichi discovers a photo of Miwa with a man she had dated in the past. When he asks her about it, he finds out that she had relationships with ten different men in the past. Even though he thinks it's in the past, he can't help but be curious. ...... In the end, he asks her about her past experiences, wanting to know the truth.