Chapter 1
A/N: Hi everyone! This is my first One Piece fanfiction, so please go easy on me. This story is actually based off an idea i've been wanting to get off my chest for a while now. I know it seems pretty unconventional, but please bear with me. Just read on and decide for yourselves whether this story deserves any merit or not. Please enjoy!
Prompt: About 100 years after the conclusion of the New Pirate Era, one of the ancient weapons goes off, destroying and practically reshaping most of the world. The remaining survivors, a few hundred East Blue Dwellers, a few thousand different species of animals, and a very limited sleugh of technology and culture is all that remains in the aftermath. The remaining culture and technology are soon abandoned, race wars break out, killing any other intelligent species remaining in the East Blue besides humans, and the world is plunged into an age of darkness. 20,000 years later, humanity has all but forgotten the past, only vaguely remembered now in stories and mythology. But Marco hasn't forgotten. One must never forget to learn from history, after all. And when it looks like mankind is about to make the same mistake twice, Marco has a decision to make this time around: to step in and potentially make things worse, or let mankind slowly but eventually perish.
Note: Humans with especially strong wills are usually reincarnated, like Shanks, Luffy, and Hancock for example, who are still around during modern times, but with no memories of their former lives.
Warning: This fanfiction contains some mature themes, including mentions of suicide, self harm, murder, and abuse. Do not read if you are triggered by any of these things.
Disclaimer: I do not, nor ever will, own One Piece. It is better that way. In the wrong hands, One Piece could very well destroy the universe as we know it. It is best left in capable and responsible hands. God bless you Oda. Or Enel, since he seems to think he's god. Whatever.