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...

Luffy and the Straw Hat crew board their trusted ship and head under the sea towards Fish-Man Island. However, getting in their way will be fierce pirates, underwater volcanoes, and a humongous sea creature!