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...

Big Mom's hunger pangs have turned her into an unstoppable force of destruction and she has her eyes on the Thousand Sunny. The only thing that has any chance of stopping her is a giant wedding cake Sani is helping construct, but can they get it to her in time? Meanwhile, Luffy's battle against Katakuri heads to a climactic finish!