Ryouko gave birth to Tatsumei when she was young. Back then, though still youthful, she worked hard and her husband was supportive, building a happy family life together. However, by the time Tatsumei entered university, her relationship with her husband had deteriorated, turning into a sexless marriage. Eventually, she discovered his infidelity, and their relationship quickly turned cold. Although they didn't divorce, the distance between them continued to grow. When summer vacation arrived, Tatsumei was scheduled to return home. Ryouko planned to meet him at the station upon his arrival, intending both to welcome him back and finally inform him about the divorce.