As a child, Monkey D. Luffy dreamed of becoming King of the Pirates. But his life changed when he accidentally ate the Gum-Gum Fruit, an enchanted Devil Fruit that gave him the ability to stretch like rubber. Its only drawback? He'll never be able to swim again-a serious handicap for an aspiring sea dog! Years later, Luffy sets off on his quest to find the "One Piece," said to be the greatest treasure in the world…

A superstar battle royale begins as Luffy's crew once again goes up against Kaido and the power players allied with the Four Emperors of the Sea. Luffy's Akazaya samurai allies are playing offense, but when Big Mom's pirate progeny get in on the action and Kaido's daughter switches sides, the fight becomes a family affair!