When Yosuke returns home from work, he finds his drunken mother and her close friend Yuriko waiting for him, gossiping about her husband. As the night deepens and his mother passes out, Yuriko reaches for Yosuke's suit with seductive movements, provocatively enticing him. Unable to resist, Yosuke gets an erection, giving in to passion and spending the night alone with her. The next day, Yuriko suddenly appears in Yosuke's room while he's working late. But why?