Maruyama, who runs a manufacturing business, takes a liking to Ren, the daughter of a subcontractor factory, and plans to somehow make her his own. He welcomed Ren into her home as his own son's tutor, threatening to limit her orders. Maruyama who rapes Ren aiming for a chance that her son is not there. Maruyama's fierce anal rape, who loves assholes. The son who peeked at such two people's indecent appearance ....

製造業を営む丸山は、下請け工場の娘・れんを気に入り、なんとか我が物にできないかと画策。発注の制限をちらつかせながら自身の息子の家庭教師としてれんを自宅に迎え入れた。息子がいない隙を狙ってれんをレイプする丸山。尻穴をこよなく愛する丸山の壮絶なアナルレイプ…。そんな二人の淫らな姿を覗き見した息子は…