One Piece fan fiction, follows the crew
The first two chapters are a bit rough, so I recommend starting with Chapter Three.
After Naruto defeated Pain, Pain left his original world.
In the world of Naruto, only his body remained.
He was resurrected in Syrup Village, the village Usopp came from, in the world of One Piece.
After learning about this world,
he thought, “Peace has never been achieved in this world either.”
So, at the invitation of the main crew, Pain began a journey to make the world feel what peace and pain truly meant.