"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!" -- from publisher's web site.