While the people celebrate the triumphant victory of a courageous hero over the demon king, the inhabitants of the dark world organize a competition. The one who emerges victorious will be recognized as the new leader. After three months, it turns out that the main candidate for the throne is a man named Helck, who effortlessly surpasses his demonic opponents. The hero is extremely combative and has a strong desire to wipe out all of humanity from the face of the Earth, as he cannot stand humans.