Kenkou Zenrakei Suieibu Umishou

Kaname Okiura, a student at Umineko Shougyou High, joins the swimming club with the goal of learning to swim. However, the club lacks competent instructors and is populated by eccentric members. When Amuro Ninagawa, a cheerful girl from Okinawa, transfers in and joins the club, she brings an unexpected energy. Her unique swimming technique and remarkable speed underwater stand out, as does her habit of swimming without clothing, which draws attention from her male peers. Okiura is particularly struck by her, as she resembles a mermaid-like being he once saw as a child.