While his wife is away on a trip, Goro is struggling with unaccustomed household chores. - Then my wife's sister, Rie, came to help with the housework. - Goro, who couldn't keep up with cleaning, happily takes Rie in, but something seems off. - Not only are they getting closer than necessary, but the feeling of her big breasts pressing against her makes her mind melt. - Goro can't help but flinch at Rie's aggressive behavior and runs into the bathroom, but he can't escape from Rie's clutches...