Millions of years ago, before true civilization, before the Mushroom Kingdom was every established, demons ruled the earth. One demon, though, was stronger than the rest. This demon was called the Black Crespúsculo, and he was rightfully named the King of Demons. Under his rule, the demons of the world flourished for hundreds of more years, until...the Star Spirits had had enough.
If the world was to prosper, they thought, it could not do so under the tact of the demons.
So, they choose one human to inherit their powers, as to destroy the demon king. The Spirits gave the man his own army and told him that the only way to get to the King was to go towards the Dusk Palace. In an epic battle between the two forces, the King was defeated. Before the warrior could deal the killing blow, the King managed to write a few words on a nearby wall: "When the red flame is born, darkness shall reign once again".
With Black Crespúsculo dead, the world rejoiced in happiness. Most of the demons were destroyed, but a few spread out and hid in secret. They hid to survive. They hid to prosper. But, mostly, they hid because they held hope that their king would return. Little did they know, he had already come, in the most unlikely form...in the form of the Mushroom Kingdom's beloved person.