Traveler in the Pirate World

An accident brought him to this sea, and a new life began. (Travel, Become Single, Invincible) Note: 1: The protagonist comes from another world and has never been in contact with One Piece. 2: The protagonist is invincible, and there are no opponents in any form or sense in the world of pirates. 3: The protagonist will only be a traveler, and will not be involved in plots that do not conform to the protagonist's setting, such as hegemony. 4: Because it is a fan work, there will be some deviations from One Piece, which is the inevitable result of secondary creation. Anything that does not conform to the original work is a secondary setting. Please treat it rationally. 5: Anyone can point out any illogical or unclear story. The author...