While his wife is away traveling, Goro struggles with household chores he is not used to handling. His wife’s older sister Rie arrives to help, and he happily welcomes her into the messy house. But something about her behavior feels strange. She presses herself against him far more than necessary, and the sensation of her huge breasts against his body nearly melts his self-control. Overwhelmed by Rie’s aggressive advances, Goro retreats to the bathroom, only to discover that he cannot escape her seductive grasp.