As her son Tatsumei grew older, Ayano and her husband gradually became sexually estranged, leaving Ayano unable to satisfy her desires and causing her emotional emptiness to deepen. One day, she discovered the shocking truth—her husband was cheating on her. He was fulfilling his sexual needs with another woman, completely disregarding Ayano. Though she couldn't forgive his betrayal, she didn't want to divorce for Tatsumei's sake. However, when Tatsumei entered university and began living independently, the couple's marriage reached its breaking point. They began living apart with divorce as the eventual goal. At this time, Ayano arranged to meet Tatsumei at the station to inform him about the divorce.