Ippei and Hiroyuki are listless even after graduating, because they were unable to pass the sash to each other in the last competition they participated in as part of the track and field team at their high school. One day, Ippei confesses to Hiroyuki the reason why he couldn't pass the sash to each other. He says that on the day before the competition, he had an intense affair with his mother, Sakiko, and couldn't run as well as he wanted. And that their relationship is still continuing to this day.... Hearing this, Hiroyuki doesn't get angry, but is simply envious. He has feelings for his stepmother, Yumi. Ippei offers to help Hiroyuki pass the sash of courage to him, but...