Maruyama, who runs a manufacturing business, becomes intensely interested in Ren, the daughter of a subcontracting factory, and plots to make her his own. Hinting at favorable order priorities, he invites Ren to his home as a private tutor for his son. Seizing the chance when his son is away, Maruyama forces himself on Ren. His obsession with her anus erupts into a brutal anal rape. Witnessing the scene, his son begins to reconsider his own position.