Hey there everyone. Sorry this isn't a story its story ideas I have for Naruto x One Piece crossovers and I would love to be able to write this story myself but I have neither the time nor the skill to write them so here they are.
the final battle between madara and harashima didn't go as madara expected, long story short he lost and in last ditch effort to kill harashima he used the Reverse Four Symbols Sealing Technique to try and kill him harashima was caught in the technique because of his injures sustain from madara. Instead of being killed by the jutsu both madara and harashima were transported to one piece world. Both ended up at different location in one piece and both were heavily injured and near death one was found by doctor (you must choose which doctor) and the other you must choose who found him and took care of him.
After being healed mardra figure out that he is in a new world seeing no point in try to go back to his world when he last lost to harashima and any chance to rule konoha. after going at sea he started to see how disgusting the world was pirates doing as they please killing and stealing whatever they want and the marine and world government not being able to full stop them and turning a blind eye to what the world noble are doing. He then decides that he is going to stop it all and give the one piece world true peace by want ever means. As madara journey begin he will meet people along the way who share his vision of peace and who will agree to help him
After harashima was healed he started his journey to find a way back home to Mito Uzumaki and the ninja village konoha during his journey he discover that madara is here and found out what his plan for the one piece world was knowing this he could not leave without dealing with madara.
Madara his all Justus including perfect sasanoo except the rinnegan he later unlock this.
Harashima has all Justus shown up till now.
if you choose use this idea let me know and i will update this to let everyone know that you will be taking on this challenge.