The story opens aboard Pirate Zap’s ship, where two of his crew members, Bonnie and Max, are exhausted and wish to escape, but lack the money to do so. Three children are being held captive on the vessel and overhear their conversation. The eldest, Amanda, whose father was a professional treasure hunter, knows the whereabouts of a great treasure and offers a deal: if they help her make a clean escape, they could claim all of the treasure. They agree, and the five of them narrowly escape, landing on a small island where they meet Luffy and his crew. Unfortunately, they are pursued; Luffy and Amanda are captured and taken back to their boss, the head of the Bayan Pirates, who is also after the treasure. Now Luffy and the others must…