As legend has it, the first Guardian of the Sun threw a harpoon into the cosmos and roped the sun to bring light and warmth to all of humanity. Then the Guardian of the Moon lured the moon to the Land of Darkness to provide a balance to the sun and supply the world with dreams.

At a momentous ceremony to appoint the two new guardians, an accident seems to occur; the heir apparent is passed over, and the title Guardian of the Moon is bestowed on the waif-like Mune, a small and frightened forest faun who seems wholly unprepared to take on such a weighty responsibility.

This news excites Necross, the nefarious ruler of the Underworld, a corrupted ex-guardian who decides to take advantage of Mune's weakness and steal back the sun for himself. Now it is up to unlikely hero Mune and his friend Glim - a headstrong young girl with wax for skin - to save the sun and restore order to the world.