K-On! (Japanese: けいおん!, Hepburn: Keion!) is a Japanese four-panel manga series written and illustrated by Kakifly. It was serialized in Houbunsha's Manga Time Kirara magazine between the May 2007 and October 2010 issues, and also serialized in Houbunsha's Manga Time Kirara Carat magazine. The manga relaunched from April 2011 to June 2012 with two separate storylines published in Manga Time Kirara and Manga Time Kirara Carat. The manga is licensed in North America by Yen Press. A spin-off manga about a different band of high school girls, K-On! Shuffle, began serialization in July 2018. The main series focuses on four young Japanese high school girls who join their school's light music club to try to save it from being abolished. However, they are the only four members of the club, one of which has little experience with guitar playing. A 13-episode anime television series adaptation produced by Kyoto Animation aired in Japan between April and June 2009. An additional original video animation (OVA) episode was released in January 2010. A 26-episode second season, titled K-On!! (with two exclamation marks), aired in Japan between April and September 2010, with an OVA episode released in March 2011. An anime film adaptation was released in Japan in December 2011. Bandai Entertainment had licensed the first season until their closure in 2012. Sentai Filmworks has since re-licensed the first season, in addition to acquiring the rights to the second season and film. K-On! has achieved strong sales in Japan, and by 2011 gross revenues had reached over ¥15 billion ($192 million) in merchandise sales. Source: Wikipedia (en)