Three sisters, Yumika, Ayano, and Mei, are concerned that they have recently gained fat. The three sisters, who are worried that they can't have a boyfriend with such a body, decide to go on a diet. Yumika invites a masseuse, Ayano a fitness equipment salesperson, and Mei an aerobics instructor to her home, and they work hard on their diet while sweating. Thanks to their hard work (?), the three sisters have successfully found boyfriends. However, the diet fever has not subsided, and he has the idea of taking a dubious medicine.
