In the Demon Realm, a vast universe where the Blood Clan, Angel Clan, and Human Clan stand among four great races, humanity was defeated in the First War of Gods and Demons and forced to sign the humiliating "Primeval Pact" in ancient times. Humans began a policy of shameful survival, quietly recuperating and biding their time...

Countless billions of years later, an unknown human expert ascended, gazing upon the desolate primeval land and its ravaged mountains and rivers, letting out a roar of fury. The grand Second War of Gods and Demons slowly unfolded with this human's cry. Humanity is destined to win, but it is fated to be a brutal war...