Dark Old Demon

Roy's life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
...
It's really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

Custom Made Demon King

<p>The total population of the eredar on Argus was not much. There were about 300 million people on the entire planet. The eredar were long-lived, so their low reproductive ability was unavoidable. Their small population was due to their highly developed civilization and technology.</p>

<p>Therefore, the fel energy transformation ritual of the eredar didn't take too long. It was basically finished in half a year.</p>

Corruption of Argus