After the Demon King's fall at the hands of a hero, the demon realm gears up for a momentous tournament to crown a new ruler. Surprisingly, the frontrunner is none other than the heroic human, Helck, who dominates his opponents with ease despite his vocal disdain for his own kind. As Helck's enigmatic motives cast doubt, Red Vamirio, one of the elite 'Four Heavenly Kings,' delves into the mystery surrounding the champion. With the future of the demon world hanging in the balance, Red must untangle Helck's true intentions to safeguard their realm's destiny.