Maruyama, who works in the manufacturing industry, likes Ren, the daughter of a subcontracted factory, and plots to make her his own. He invites Ren into his home as a tutor for his son, threatening to restrict orders. Maruyama takes advantage of an opportunity when his son is not around to rape Ren. Maruyama, who loves anal sex, commits a brutal anal rape... The son sees the two of them in a lewd state...