Crunchyroll writes: "After the first 50-episode TV anime series aired on TV Tokyo from October 2006 to September 2007, the anime sequel episodes based on Syun Matsuena's Kenichi: The Mightiest Disciple shonen action manga have been bundled with the manga tankobon's limited edition since the 46th volume released in March 2012. The latest 55th volume published on February 18 this year came with a DVD containing the 8th and 9th OVA episodes.
Shogakukan officially announced today on March 5 that the OVA series will be started airing on Tokyo MX and BS 11 on April 8, as the 11-episode TV series titled Kenichi: The Mightiest Disciple Yami no Shugeki (The Attack of Darkness). Due to the broadcast time limit, the on-air version will be edited and a bit shorter than the original OVA version. Brain's Base has animated the OVA series after TMS Entertainment for the first TV series."