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Kenichi: The Mightiest Disciple is a Japanese manga by Syun Matsuena serialized in the weekly manga magazine Shōnen Sunday.
This manga is a remake of Tatakae! Ryōzanpaku Shijō Saikyō no Deshi, which was serialized in the monthly manga magazine Shōnen Sunday Super, publishing five tankōbon between 2000 and 2002.
The first tankōbon was published on August 9, 2002. An anime adaptation by Tokyo Movie Shinsha aired 50 episodes from October 2006 to September 2007. Brain's Base produced OVAs for the series, which continue from the Ragnarok Arc. The first OVA was released on March 14, 2012, the second OVA was released on June 18, 2012, and a third OVA was released on November 16, 2012.