The story takes place on the fictional distant planet of "Luminaire". The conflict of the plot revolves around the need to control the Lightstar Crystal. This powerful crystal powers the great city of Luminicity. Baron Dark, the show's main villain, tried to steal the crystal in order to gain control over its incredible power. He only succeeded in obtaining half of the crystal, with the other half being obtained by Prince Lightstar.
The half of the crystal that the Baron Dark managed to obtain turns him into a living skeleton. It also gives him the power to turn those with evil hearts into living skeletons for his army. Each episode involves Prince Lightstar, his siblings and Baron Dark attempting to obtain the other half of their respective crystals in order to gain control over the planet.