Manga
Kannagi began as a manga series written and illustrated by Eri Takenashi and began serialization in the inaugural January 2006 issue of Ichijinsha's shōnen manga magazine Comic Rex sold on December 9, 2005. The manga went on a hiatus in December 2008 after Takenashi developed a subarachnoid hemorrhage in November 2008.[3][4][5] The manga resumed with the September 2011 issue of Comic Rex on July 27, 2011, but due to ongoing concerns for her health, Takenashi warned in June 2011 that the series' publishing schedule would be irregular, though her goal was for a bi-monthly release.[6][7] The series concluded in the September 2017 issue of Comic Rex released on July 27, 2017.[8]
The first tankōbon volume was released on August 9, 2006, under Ichijinsha's Rex Comics imprint;[9] as of July 27, 2016, 11 volumes have been released in Japan.[10] Bandai Entertainment licensed the manga for distribution in North America.[11] However, after publishing the first three volumes in the series, further releases were halted in 2012 as a result of Bandai Entertainment's restructuring.[12][13]
A spin-off manga titled Kanpachi: Crazy Seriola Dumerili written and illustrated by Takenashi's brother Shinichi Yuhki was serialized from March 9, 2010, to March 26, 2016, in Comic Rex.[14] The first volume was released on October 27, 2010; as of June 27, 2013, five volumes have been released.
Internet radio show
An Internet radio show to promote the anime series was broadcast between June 11, 2008, and April 7, 2009, with ten episodes being produced. The show is hosted by Haruka Tomatsu (who plays Nagi in the anime), Hideyuki Kurata (the anime's screenwriter), and Yutaka Yamamoto (the anime's director). The broadcasts are distributed on the anime's official website.[15]
Anime
An anime adaptation was produced by the animation studio A-1 Pictures, directed by Yutaka Yamamoto, and with screenplay by Hideyuki Kurata. The anime aired in Japan between October 4 and December 27, 2008, and consisted of thirteen episodes.[16] The anime was dropped by the satellite channel BS11 Digital before it started airing; no explanation was given.[17] An original video animation episode was shipped with the final Japanese DVD volume on May 27, 2009. Bandai Entertainment licensed the anime and released the first of two seven-episode DVD compilation volumes on July 17, 2009. The second volume was released on September 24, 2009.[18]
Light novel
A light novel written by Tōka Takei, with illustrations by Eri Takenashi and Kasumu Kirino, was published by Ichijinsha under their Ichijinsha Bunko imprint on December 20, 2008.[19]
