Voice of the Kami: An Epic Adventure of Japanese Folklore and Yokai Hunting (Paperback) (ISBN-13: 9798243632515)

From the depths of Yomi's dark realm, the First, queen of the yōkai, prepares her vengeance on the kami. Her wrath will not be stopped, not even by the members of the Yaseki and the Daughter of the Sun they've just saved, for her power and that of her four tengu sons is too great.

The only thing she fears is a story passed down through the centuries in Yomi. The story of a human speaking with the Voice of the Kami. This power, if it truly exists, would tip the balance in the war with the yōkai.

Ren, however, doubts any of it, for the bearer of this knowledge is none other than one of the four tengu, and unsealing this Voice means heading back to Aokigahara and the ghosts of his troubled past.