Reiko Kobayakawa married young and gave birth to her son Tatsuki. They were a cooperative couple who built a happy family life. However, as Tatsuki grew older, their relationship gradually turned cold, leading to a severe lack of intimacy. Rumors of her husband's infidelity began to spread, worsening their marriage day by day. When Tatsuki entered university and left home, divorce became an unavoidable reality. Eventually, Reiko reached the point where she had to inform Tatsuki about the divorce and submit the official paperwork. With Tatsuki planning to return home for summer break, Reiko arranged to meet him at the station to deliver the news.