While the day belongs to humans, the night belongs to yokai,supernatural creatures that thrive on human fear. Caught between theseworlds is Rikuo Nura. He's three-quarters human, but his grandfather isnone other than Nurarihyon, the supreme commander of the Nura clan, apowerful yokai consortium. So, Rikuo is an ordinary teenager threequarters of the time, until his yokai blood awakens. Then Rikuotransforms into the future leader of the Nura clan, leading a hundreddemons. Key members of the Nura clan plunge into battle with the Gokadoin clan, but as the battle wears on, Rikuo struggles to keep his clan energized for battle. Meanwhile, Ryuji seeks a way to penetrate the Gokadoin stronghold…Aoi Spiral Castle!