The story is set in the world of Pirate King, spanning from the Rocks era to the formation of the New World order after Roger's death. In the Rocks era, pirates ran rampant, and the Rocks Pirates sought to dominate the world. Later, Roger ushered in the Great Pirate Era, and the world became caught up in a frenzied pursuit of One Piece, while the Four Emperors carved up the New World. Devil Fruit Users and masters of physical combat shone in battle, and the Haki system gradually took shape. Major pirate crews, the Marines, and mysterious forces engaged in fierce rivalries over power, treasure, and the truth of history.
