As a boy, Monkey D. Luffy dreamed of becoming the King of the Pirates, but everything changed the day he accidentally ate the Gum-Gum Fruit—a mysterious Devil Fruit that turned his body into rubber at the cost of his ability to swim. Now, years later, he sets out to claim the legendary treasure known as the “One Piece.” Meanwhile, village trickster Usopp—famous for shouting false alarms of approaching pirates—finds himself in real danger when Captain Kuro of the Black Cat Pirates, long disguised as a gentle butler, finally moves forward with his sinister plan. With no one believing his warnings, Usopp seems out of options…until Luffy steps in to help.