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...

Talk about impossible! Luffy and the Straw Hats have to find a way to sail to an island in the sky, and the only one who can show them the way is known to be a greater liar than Usopp! It won't be easy, but can they trust their lives to someone nobody believes in?!