The elemental tide that occurs once in a thousand years caused an elemental rage. Countless undead souls that were supposed to be sleeping were invaded by the chaotic and violent elements. They crawled out of the ground one after another and wandered angrily in the wilderness and became sleepless people. A large number of ancient creatures gradually revived and poured into the mainland. They stared greedily at the living life here and became ancient killers. Mainland historians call this turbulent, chaotic, and bloody period the Black Tide.
The dark tide struck, and the female aristocrat who traveled from Japan - Yesiah Jane Akaraine accidentally obtained the "Fifth Book" representing the will of nature in this dark age, and then embarked on the path of inheritance of the fifth apostle.