Pocha Pocha Suieibu

A 15-year-old girl named Oota Katsuyo begins high school and is disappointed when her middle school crush expresses a preference for thinner girls. While seeking ways to lose weight, she meets Itou Hatsume, the laid-back president of the swimming club, and Kaji Rinko, the strict vice-president, who are seeking new members. Katsuyo also meets Kaitani Ayumi, a slim girl with a large appetite, who brings her to the club. Katsuyo considers whether she can meet the club's expectations or if she will struggle to keep up.