In ancient times, the Jinu continent was divided into three realms: upper, middle and lower. After a war between the three realms about three million and five thousand years ago, the three realms were divided into two realms, one secret realm. There is one realm of immortals and demons, one realm of humans, and the secret realm is ruled by the nine-tailed civet clan. The human race was not satisfied with the land of one realm, and launched a war again, intending to unite with the immortals and demons to seize the secret realm, but was defeated by the secret realm army with one blow. In order to avoid disasters, the secret realm was created by a powerful person to create a continent and hide in seclusion. N years have passed since then, and humans, immortals and demons have returned to the same realm. However, the human race has never given up searching for the Nine Spirits Secret Realm...