One Piece: Shaking the World from the New World

After transmigrating into the world of Pirate King, the System was down from the start.

To make matters worse, the beginner's village he transmigrated into was the New World, the second half of the Grand Line.

He gained methods for cultivating the Three Types of Haki and a powerful Devil Fruit ability. He witnessed the earth-shaking meeting between Shanks and Whitebeard, rescued Ace at Marineford, and became the fifth emperor of the sea before Luffy...