Prologue
"He had one Job."
"One fucking job."
"And what does he do?"
"He let Muzan get away."
"He failed to kill his brother."
"He made the demon's population increase tenfold."
"Was this my fault... Was I too selfish in keeping the balance that I made him have potential and potential only in the mark?"
"My children, my creations, my inhabitants, are all dying because of me, because I failed to give Yoriichi more power, to handle the anomaly, the devil, the itch that never leaves me... The creation of the Devil himself, the Dr. Muzan killed, the evil who roams, the most despicable thing since the advent of chaos itself."
"... No more will I be selfish... No more will I worry about the consequences, if there shall be an anomaly too powerful for this world to handle, it will an anomaly too kind for this world."
These were the world of the world itself, the world aka, Gaia... Aka Mother Nature, she was not a divine being for say, or much less a she or he to begin with, but a collective Idea that there exists a higher power, it was not omnipotent, nor was it all-knowing, but powerful it was.
Gaia came to be when the first idea of God was established upon the conscious mind, she is a conceptual being that encompasses the world, she was all, and was none, that was its true form, everything that breathes, living and nonliving was her.
Albeit, if the idea of God came to be when intellectual consciousness was established into existence, of course, the idea of evil and the Devil would be born similarly.
Chaos. Aka the Devil, The evil, Sin, and destruction were the manifestation of all things vile and heinous.
Just like Gaia; Chaos was born from the collective unconscious of men, albeit of a negative nature, Chaos was all things bad diminished of kindness and good.
Since the dawn of the first man, Gaia, and Chaos had been at war with one another, and both sides hate each other equally; although in the end, they are philosophical ideas whose power and influence exist on a physical level.
Throughout the Years Chaos has done many unforgivable things... But Muzan had to be the most vilest thing it created, and all for the sake of shits and giggles.
The world was in Chaos, pure utter Chaos, as a result, this had to be fixed, and the balance had to return...
No matter the consequences.
The world had an idea... Yoriichi was too weak, if he was a bit faster maybe he would have won, but that wasn't the case at all, he was a start albeit incomplete; an anti-virus that only lasted so long.
This wasn't good enough, something more had to be done.
Something greater needed to be initiated.
The world didn't need fixing. No, it needed to be reset and remade.
At first, Gaia wanted to toss an asteroid into the planet, which would have killed all the Demons, but also the humans, along with the animals and plant life.
Million of the year of natural selection would have been erased. With all honesty, Gaia was seriously considering the idea, what was another million years to her anyway; however if all the humans in the world die, Chaos would die, along with her, so it was pointless.
Albeit there was another method of similar nature if Chaos wanted to play dirty by creating Muzan, then she just has to take from its book.
"Break the rules."
"Create something that surpasses the natural order."
"Make it better."
"Make it stronger."
"Make it faster."
"Make it smarter."
"Make it a lot more powerful."
And so that was Gaia's decision, to counter the evil that was Muzan a horrendous creation of Chaos, Gaia for the second and hopefully for the last time.
Began to create the Antithesis of this world's problems and a solution to the world's misfortunes, and his name was Tanjiro Kamado.