__Height:__ 162 cm  
__Clan:__ Gyuki Clan  
__Affiliation:__ Nura Clan  

Mezumaru is the Gyuki Clan's young head assistant. He can control humans with strings and has a feminine appearance while not wearing his horse skull. His personality, while straightforward and determined, is also slightly naive and ditzy.

Rikuo Nura appears to be an average middle school student. No one knows that he comes home every day to a house full of youkai, nor that he transforms into the all-powerful leader of these spirits at night. However, much to the disappointment of many, Rikuo is determined to live as normal a life as possible.

At first glance, Nura Rikuo seems like nothing more than a normal middle-schooler. In actual fact, he is grandson of Nurarihyon, master of a youkai clan. Having only recently resolved the hostilities between the Nura Clan and the Shikoku Yokai, Rikuo finds no rest as an ancient enemy of the Nura Clan, Haguromo-Gitsune, resurfaces. After 400 years of inactivity, Haguromo-Gitsune suddenly sweeps through Kyoto with overwhelming power.

Rikuo grew up in a house full of yokai, so he always thought they were cool. But the kids in his class talk about yokai like they're bad! When his grandfather announces Rikuo as his chosen heir to run the Nura clan, Rikuo is torn between his human nature and his duties as a yokai. The rest of the clan's not so crazy about a wimpy part-human as their ruler, particularly Gagoze, a high-ranking yokai who would rather eat a human than be ruled by one.
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(Source: Viz Media)

A special shown at the Jump Super Anime Tour 2010. It was later released as an extra accompanying Nurarihyon no Mago Blu-ray Box 1. 