As a child, Monkey D. Luffy dreamed of becoming King of the Pirates. But his life changed when he accidentally gained the power to stretch like rubber...at the cost of never being able to swim again! Years, later, Luffy sets off in search of the "One Piece," said to be the greatest treasure in the world...

With Sanji forced into a political marriage by his scheming family, Luffy and members of the Straw Hats enter enemy territory to try to rescue him. But up against Big Mom, an Emperor of the Sea, do they even stand a chance?