World Hopping Slaughter System WHSS

Current World : One Piece

Jonathan Star was reincarnated with the World Hopping Slaughter System giving him only one way to level up and become strong - Slaughter.

He finds himself in the first world of One Piece as the system gives him the quest to become an Emperor of the Seas within a year or die.

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Disclaimer - I do not own One Piece or the cover art.