Kenkou Zenrakei Suieibu Umishou - S01

Kaname Okiura, a student at Prefectoral Umineko Shougyou High (called "Umishou" for short),joins the school’s swimming club to learn how to swim. But the club is full of oddballs-hardly the best teachers. Then Amuro Ninagawa, a cheerful and carefree girl who transferred from Okinawa, arrives. Her incredible speed underwater and unconventional swimming style, along with her habit of swimming nude (which naturally draws the attention of the boys),shocks the entire club. For Okiura, it’s even more surprising-she reminds him of a mermaid-like creature he glimpsed once as a child.