The Demon King

What would happen if all of the bad people in history be them thieves, rapers, killers, madmen, Psycho-shitty people, jerks, dictators, and evil people, in general, didn't die or didn't lose?
What would happen if all of these people succeeded in their evil dreams, or works?
Have you ever wondered, what would happen if Hitler didn't die? Will the world of today still be the same?
What would happen if Oda Nobunaga managed to survive the assassination, and united Japan under his rule? Will Japan be the same one of today?
What would happen...
What would happen...
What defines Evil from Good?
Why doing this is something good but doing that is something Evil?
What defines light from darkness?
Why everything that has lighted upon it is considered good, but anything that has darkness upon it is considered bad?
What would happen if the sickest person, the Evilest, that demons fear him is set free, free from all the shackles and chains that bound him. What will he do?
Will he lose himself to his inner self?
Will he fight for his new ambitions?

This is a Tale of a young man, who is not from our world, nor from a world, we know of, this is a tale of a young man, who made a pact with a devil, a devil that became his companion. A devil, that became witness to the rise of the demon king.
How did this demon King that made heavens hells and hells heavens, become a demon king?
Hahahaha, read his story!
This is the tale of the demon king!