Five years after losing his mother, father Saburo decides to hire a housekeeper. His mischievous sons Hikari and Shunro also agree immediately, and soon Rieko is dispatched from the housekeeper center. Rieko is perfect at cooking and cleaning, and her exposed cleavage excites Hikari and Shunro. One night, they hear lewd noises coming from somewhere. Following the sound, they witness their father having sex with Rieko in the tatami room. They photograph the scene and decide to turn Rieko into an internal ejaculation pet starting the next day…
