Kid, a 15-year-old hard laborer, steals a map that promises to reveal the location of the notorious pirate Black Mor's treasure. Together with his crew -- MacGregor, Beanpole, Taka and Jim the monkey -- Kid procures a vessel and sets out to sea.

Celestine is a little mouse trying to avoid a dental career while Ernest is a big bear craving an artistic outlet. When Celestine meets Ernest, they overcome their natural enmity by forging a life of crime together.

There is a world with two towns that are big enemies: Pyross and Hydross.