Penguin Musume (ペンギン娘, Pengin Musume?) is a Japanese manga series, written by manga author Tetsuya Takahashi. The manga was serialized in the Japanese shōnen manga magazine Weekly Shōnen Champion between 2006 and 2007. After the manga ended serialization in Weekly Shōnen Champion, the serialization was restarted from the February 2008 issue of Champion Red magazine with the Penguin Musume Max title. An original net animation adaptation entitled Penguin Musume Heart (ペンギン娘♥はぁと, Pengin Musume ♥ Haato?) began streaming on Nico Nico Douga starting on April 19, 2008 .

Source: Wikipedia