"In a world where the fate of Ragnarok hangs in the balance, warriors from various realms and eras are summoned to participate in the grand tournament known as 'Theomachi.' Each round pits legendary fighters against one another, with the victors earning the right to lead the charge in the ultimate battle of Ragnarok. As the tournament progresses, alliances are tested, and the true nature of power and destiny is revealed."

Warrior Doran Flamekeeper is sent to the temple of Drakespire Citadel to slay a beast. As he approaches, Doran appears to be a formidable slayer, but his cowardice is revealed when his life flashes before his eyes. When the monster appears, Doran's strength is unveiled, though he remains an idiotic hero.

One and Megumi tracked down the Hazbin thieves and vowed to stop them for good. During their mission, they faced an unexpected, more dangerous threat. This danger emerged when they confronted the boss of the thieves.