One day, Kaori starts to notice that her husband has "changed", and while talking to her best friend, Yuki, she learns that Takuya has a secret account with a number of posts that hint at a likely affair. Kaori later discovers that the woman he is having an affair with is Mishima Mutsumi, and visits Matsumi's husband Kyosuke. She asks for his cooperation in helping her to separate the two. Kyosuke agrees with one condition - that Kaori has to sleep with him. While continuing to monitor both Takuya and Matsumi, Kaori begins having an affair with Kyosuke, and winds up falling in love with him.
—Drama-Otaku