One day, when Luffy, Zoro, and Nami were starving on their little boat, they are attacked by a long-neck dragon. The dragon wrecks the boat when Luffy bites into it, then takes Nami back with it. Meanwhile, Luffy and Zoro wash up on the shores of an island where Ganzack is using the island's inhabitants as slave labor to complete his base and ship. There, the two boys meet a girl named Medaka. Together with the girl, they infiltrate Ganzack's base..