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. The time is the early 1600s, and the young Nurarihyon has become infatuated with Yo-Hime, a girl with mysterious healing powers. He proposes to her. But then Yo-Hime is abducted by subordinates of the great yokai Hagoromo-Gitsune. And she wants to cut her apart and steal what makes her special! Find out how Rikuo's grandfather once had to almost sacrifice everything to save the woman he loved!