While her husband was away on a business trip for two weeks, Kazumi was staying with her daughter and son-in-law. They lived happily for a while, but one day she noticed that her daughter and son-in-law were being considerate of her and refraining from having sex at night. Worried that she was making her stepson sexually frustrated, when they were alone, Kazumi offered to "take care of it for me." She just wanted to make amends. At the time, Kazumi never dreamed that her actions would cause her stepson to have forbidden feelings.