Once every thousand years, the incredible Sea Dragon reappears! It is said that the first person it lays eyes upon will become its master and be able to control its extraordinary powers. The time has come: the Sea Dragon is about to return at any moment! Master Fox wishes to use the Sea Dragon's powers to reign over the Squirming Archipelago. But he will need the help of his servant, the cowardly and naive cat Menji. But others are also searching for the legendary Sea Dragon.