At the beginning of time, who passed down the Way? What lies beyond the Nine Provinces? The Classic of Mountains and Seas is no myth, but a history book sealed away by the passage of time. Most of the rare creatures recorded in it live hidden in the shadows of modern society, disguised in human form.
Human society and these shapeshifters signed the Treaty for Human and Demon Coexistence over a thousand years ago. Yet the extremist human organization known as the Purification Society has always believed that “those who are not of our kind can never be trusted,” and secretly hunts these ancient survivors. The Keepers of the Book, made up of shapeshifters and humans with spiritual powers, protect the truth of the Classic of Mountains and Seas and preserve this fragile balance.
Until, in the present day, a human professor of folklore meets a divine beast claiming to come from the Classic of Mountains and Seas. At last, one corner of a secret war that has raged for three thousand years is lifted...
