Five thousand years ago, mighty beings known as the Dragons roamed the world. They dominated with their strength, intellect, hard scales, and mythical powers. No being dared to raise their gaze in their presence.

Once, the God tribe attempted to do so. The outcome: complete defeat for the tribe. This result shook the world, establishing the dragons as the kings of all monsters and the Gods of Gods. They were bestowed with titles such as the God Slayers, Demon Slayers, Monster King, Ruler of the World, and more.

However, all of this was in the past. Strangely, the power of the dragons started to wane after their Emperor, Dragon Dracia, unexpectedly died 5,000 years ago.

Today, 5,000 years later, the Dragons are mere slaves and regarded as the lowest of all creatures on Earth. Despite their large numbers, they are considered weaklings and cowards, hunted for their scales and flesh. Their claws are torn from their bodies, and even their hearts, considered a delicacy, are removed. What's worse... even slimes and goblins bully them! Quite the embarrassment.

But Azeth, a Grand Mage of the Reiz Empire, finds himself reincarnated as a dragon. Rather than cursing his fate, he thanks for the second chance… a chance for taking revenge against the very humans who killed his family and his lover. With the desire for revenge, the very being of Azeth had been changed, which now had manifested in the form of the Chaos Dragon!