Peace has reigned for fifty years since the Hero defeated the Demon Kings and claimed supremacy over all. Yet with the demonic throne now empty, the ancient race rises—warlords contend for dominion as humanity prepares to crown a new hero to oppose them. Bel exists in servitude, a stable boy in a lower-class noble household, spending his days tending gardens and pruning roses for banquets he will never attend. He is merely a lowly servant trapped in a world ruled by bloodlines and magic, his existence beneath notice. Everything changes in a moment of fire and death. When demons assault the manor, Bel awaits execution before his master. A great demon leader intercedes—something awakens in her gaze. She recognizes him for what he truly is: a member of an ancient, monstrous species thought extinct since before the previous Demon King's ascension. She speaks his true name. His blood ignites. The great demon spares him, moved by curiosity and pity. But rather than execute him, Bel's master sees an opportunity—to elevate his family's standing by binding this powerful being to his service, raising him within the household's inner circles. Yet supreme power cannot remain shackled. The force that courses through Bel's awakened veins is wild and untamed, and nothing in his blood proves more dangerous than the truth of his own nature.