A big monster attacks Luffy and his crew of Zoro and Nami as they are famished on their little boat. Nami is kidnapped, while Luffy and Zoro end up on the beach. They encounter a young girl named Medaka and learn about the island's tragic history. All of the men in the hamlet, including Medaka's father, have been enslaved by the terrible Pirate Ganzack. To save the villagers and Nami, Luffy, Zoro, and Medaka must enter Ganzack's base.