Shiho gave birth to Suuki when she was 20. As her Yuki grew, she became sexless with her husband, but her sexual desire for Shiho increased. However, one day, her husband's affair was discovered, and the couple's relationship quickly cooled down. After Yuki entered university, talks of divorce progressed, and all that was left was to submit the notification. When Yuki returned home during summer vacation, Shiho waited for her son at her station to report to Yuki before her report.
