In a hotel for their anniversary, Ichiko makes an advance on her husband. However, she is shocked when Otoya rejects her because of his mistress, Mitsuki. Although Ichiko permitted his affair, Otoya's rejection leaves her confused and hurt. Seeking advice from her friend, Ichiko is reminded that she is also allowed to have an affair. So she turns to an old college friend to fulfill her desires.

Ichiko and Otoya decide they want to have a baby. They start fertility treatments, but the stress and repeated failures take a toll on Ichiko. She finally confesses to Otoya that she is unable to picture a future with him without children, so they decide to get a divorce. Months later, the sudden death of Ichiko's mother unexpectedly brings her ex-husband back to her side.