As peace is restored in the Demon Realm, Anos Voldigoad desires nothing more than to put his reputation as the Demon King of Tyranny behind him and return to his days as a misfit at Demon King Academy. However, this tranquility is short-lived as sinister demons, kings, and deities plot against him from the shadows. There are rumors of a "Child of God," whose power may rival that of Anos. To uncover the truth and eliminate this potential threat, Anos must embark on a journey deep into the land of spirits. However, this spirit world is shrouded in mystery and can only be entered after completing challenging trials. With his unmatched power and confidence, Anos prepares to face various formidable enemies with grandiose titles. But with the help of his trusted allies, he will barely need to break a sweat as he is truly the Demon King of Tyranny.