One Piece: The Fourth Brother

Fate tried to kill Ace. I said no. In the heart of the greatest war in history, a fourth brother stepped out of the shadows. With the world watching, the brothers did the impossible—they survived. Now, the seas are no longer ruled by the old guard. From the "War God" Dragon Soul to the "Bright King" Luffy, the four brothers have ascended. No more running. No more losing. The Navy is in retreat, the World Government is in a panic, and the Four Emperors' throne has new masters. This is their sea. This is their era. — Description from novelcodex.org