Five years have passed since she got married, and Yuino says her married life has lost excitement. Although she used to be busy, they would celebrate anniversaries and go on trips together, but in recent years, that hasn't happened at all. Furthermore, the lack of communication with her husband is serious, and they rarely eat together, let alone have sex at night, and recently they even started sleeping in separate bedrooms. Perhaps because of this loneliness in her daily life, Kokoro has begun to feel like cheating in order to fill the void in Kokoro .