Kenkō Zenrakei Suieibu Umishō (ケンコー全裸系水泳部 ウミショー, lit. "Healthy All-nude Swim Team Seacats Commerce High") is a Japanese manga series written and illustrated by Mitsuru Hattori. It was serialized in Kodansha's shōnen manga magazine Weekly Shōnen Magazine from July 2005 to April 2008, with its chapters collected in nine tankōbon volumes. A 13-episode anime television series, produced by Artland and directed by Kōichirō Sōtome, was broadcast from July to September 2007.