Kenkou Zenra-kei Suiei-bu Umishou

Kaname Okiura, a student at Prefectoral Umineko Shougyou High (also known as "Umishou"), joined the swimming club at his school in an effort to learn how to swim, but the group is full of weirdos and has no one who can instruct him in the sport. Then Amuro Ninagawa, a cheerful, upbeat girl who had transferred from Okinawa, joined the group. She astounded every club member, especially Okiura, who compares her to a mermaid-like creature he only once saw in his early childhood. She also surprised everyone else with her extraordinary underwater speed and unconventional swimming style (plus her personal habit of swimming naked—a strong magnet to teenage boys).