Ever since his wife went back to her parents' home to give birth, Daisuke has been living like a slob. Then her older sister Chihiro suddenly arrives to take care of the housework. Fed up with his ever-growing mess, he gladly welcomes her—but every time she cleans, he catches glimpses beneath her skirt and cannot take his eyes off her sensual thighs. As the carefree Chihiro presses close and flashes him her adorable smile, the last of his self-control begins to disappear...