Ippei and Hiroyuki were both members of the track team at the same high school, but failed to pass the baton during their final relay race, after which they fell into a lifeless, unmotivated existence. Even after graduation, their bond remained. One day, Ippei confesses to Hiroyuki the reason they failed to connect the baton: the night before the race, he had a sexual encounter with his mother, Sakiko. That incident left a deep psychological mark on him, continuing to shape his life to this day. Hearing this, Hiroyuki doesn't react with anger—but with envy. The reason? He harbors intense feelings for his stepmother, Yumi. Gathering his courage, Ippei pleads with Hiroyuki for help, begging him to finally "pass the baton." But will his desperate wish ever be fulfilled?