Five years after losing their mother, Saburo's father decides to hire a housekeeper. The mischievous brothers Hikaru and Toshiro agree, and Rieko is soon sent from the housekeeper center. Rieko is perfect at cooking and cleaning, and Hikaru and Toshiro can't hide their excitement at her defenseless chest. Then one night, they hear a lewd voice echoing from somewhere. They follow the voice and witness Rieko having sex with their father in a Japanese-style room. The two take a photo of the scene, and decide to make Rieko their creampie pet from the next day...