Oni Hitokuchi is a Kyoto Youkai who works in tandem with Satori and is one of Hagoromo Gitsune's loyal followers.  400 years ago, he and Satori gathered princesses with abilities for Hagoromo Gitsune to eat. They used the ploy of making the princesses concubines of Hideyori Toyotomi to buy them away from their families. When they visited Youhime's father and he had greedy thoughts, Oni Hitokuchi beat him to death.

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)