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

Countless demons gathered near the black mist, waiting for the moment when the giant Gate of the Abyss would open.

Not only demons but even some monsters were participating, as though they were about to attend a grand festival. Such a large-scale war summons caused a commotion in the entire Abyss.

Roy was among these demons, but he lowered his head and ordered Fat Tiger beside him in a low voice, "Fat Tiger, go back to our lair and take care of the house. Don't follow me this time!"

Fat Tiger had no doubts about Roy's order at all. His three heads barked at Roy, then he spread his wings and flew back.

Roy had his reasons for making Fat Tiger go back. He was very clear that such a large-scale war summons meant that the demons might encounter an extremely strong opponent. By having Fat Tiger stay in the Abyss, once Roy encountered any danger, he could use his Teleport skill to return to the Abyss directly.

Judgment Day