In Fairy Tail, I Transform into the Black Dragon King from the Start

What exactly is a Demon King,

that makes everyone fear them?

Ye Chen, who arrived in the Fairy Tail world, had no idea what a Demon King was. But having gained the power of one, he would explore the fate of a Demon King...

In a place of evil, at the heart of despair, a Demon King who could absorb every ability sought the meaning of fate!

"I wield the wings of despair, yet feed upon despair; I awaken from the world of the living to bring eternal death to all. I am the Demon King who will destroy the world!"

The Demon King, reveling in despair and cries of anguish, descended at this very moment!

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.