One Piece: Strong World

When the Straw Hats catch wind of trouble in the peaceful waters of the East Blue, they quickly set a course for home! But before they reach their destination, fate leads them into the deadly path of Golden Lion Shiki. This gravity-defying madman needs a navigator, and he wants Nami! Shiki scatters the Straw Hats across the far corners of a floating island filled with ferocious, genetically-mutated monsters, and issues Nami and ultimatum: join his crew - or her friends die!
Big mistake. Luffy kicks his attack mode into Third Gear and begins a brutal rampage across the beast-ridden island. It's all hands on deck in Monkey vs. Lion. Winner gets the navigator!