In a world on the brink of collapse, a young man named Rio Takeo discovers an ancient, world-shaking secret. Chosen by the primordial Dragon of Elements, Rio is thrust into a brutal war against the high-ranking demons of the Underworld. Alongside his powerful allies—Kazu, Kamiko, and Tetsu—Rio forms the 11th Squad, standing as humanity's last line of defense.But Rio is no ordinary warrior; he is the vessel of "The Sovereign," a cosmic entity feared by demons for millennia. After an apocalyptic battle in Paris where Rio single-handedly crushes five nation-destroying monsters using his awe-inspiring Sovereign State, he becomes a global icon—and a massive target.As political superpowers and shadowy factions conspire to eliminate him, an ancient prophecy unravels: Rio's true enemies aren't the demons, but the world's hidden rulers. He must carry the sins of kings and walk a path paved with blood to finish what was started thousands of years ago.