Yalatola

"The Demon Lords are bringers of destruction, and among them, I am the strongest."

The Demon King has fallen, slain by the Hero in a battle that shook the heavens.

After this, humanity knew a long era of peace and prosperity, with the hero now at the top of the world.

Fifty years after the battle, the demon race is resurfacing, but now with the throne empty, they must fight for the emergence of the new Demon King. Meanwhile, the humans are preparing for the rise of the next hero who will oppose their archenemies.

Born as a mere stable boy in a lower-class noble household, Bel has lived his life tending to the noble gardens, pruning roses for banquets he would never attend. He is nothing more than a lowly servant in a world ruled by noble bloodlines and magic.

However, his fate changes when a demon attack devastates the household. As flames consume the estate, Bel is about to be executed in front of his master when their leader, a great demon, recognizes him as a member of a powerful species of monsters that had disappeared before the ascent of the previous Demon King. 

She calls him by his true name, awakening his true blood.

The demon, intrigued by this discovery, decides to spare him out of curiosity and pity. Having learned about Bel’s true nature, his master, rather than executing him, chooses instead to bring him into the heart of his household, seeing in him an opportunity to elevate his family’s standing by binding a powerful being to his service. 

But power cannot be shackled forever, and among them, the one in Bel's blood is the most dangerous.

Dragon King: Throne of Demons and Gods

The cave fell into a heavy silence.

Vezalia stood still, her umbrella pointed at Bel like a quiet accusation. The purple flames around her flickered gently, casting dancing shadows on the ice.

He stared at her, his expression unreadable. Inside, his thoughts were crumbling.

For the second time since this meeting began, he had no words.

"A demon?" he thought. "I was living like a demon?"

It didn't make sense. Humans killed too. Adventurers did it all the time. Knights, hunters. Everyone.

Killing alone didn't make you a demon.

Something monstrous. He had always chased that instinct, always longed to live by it. The hunger, the battles, the growing power... Was that it?

If a dragon was a form of demon, wasn't he... already one of them?

The Forbidden Gift