Fifteen-year-old Oota Katsuyo is embarking on her high school journey as a short and plump girl due to her family's tonkatsu business. Despite following her crush to the same school, she is disheartened to learn he is not attracted to curvier girls. As she seeks ways to shed some weight, the swimming club's unconventional president, Itou Hatsume, and strict vice-president, Kaji Rinko, are on the hunt for fresh recruits to join their small team. Katsuyo meets Kaitani Ayumi, a similarly ravenous and slim girl who introduces her to the swim club. Can Katsuyo rise to the challenge of the club's demands, or will she fail to make a splash?
