Nura

A supernatural saga of a 13-year-old by day, and a leader of a demon clan by night-straight from the pages of Weekly Shonen Jump!

While the day belongs to humans, the night belongs to yokai,
supernatural creatures that thrive on human fear. Caught between these
worlds is Rikuo Nura. He's three-quarters human, but his grandfather is
none other than Nurarihyon, the supreme commander of the Nura clan, a
powerful yokai consortium. So, Rikuo is an ordinary teenager three
quarters of the time, until his yokai blood awakens. Then Rikuo
transforms into the future leader of the Nura clan, leading a hundred
demons.

As Nurarihyon is attacked by hordes of angry Kyoto yokai, Rikuo and his hundred demons arrive to attempt to take down Hagoromo-Gitsune, a yokai about to give birth to a dangerous dark-arts yokai from the past! A massive battle ensues that reveals secrets of Rikuo's family history...and puts him in some serious risk of bodily harm!