According to Comic Natalie, a new original anime video for supernatural-action anime series Nurarihyon no Mago was announced

OVA is set to released on March 4, 2013 and it will be bundled with the final volume of the manga series. This is aside from the OVA that will be released on December 4 along with the 24th volume of the manga

The new OVA will revolves around the story of the Nura Clan on how it was established by Nurarihyon.

Source: Comic Natalie via MyAnimeList News