The series follows Kotaro’s fight to rescue his brother, destroy Gorgom’s three high priests (the ), and prevent Nobuhiko from becoming the new Creation King.

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Kotaro escapes during the transformation ceremony before his brainwashing is complete. He becomes , a "Child of the Sun" powered by the Red Kingstone . Nobuhiko remains and is fully transformed into Shadow Moon , the "Child of the Moon" powered by the Green Kingstone , becoming Black's tragic rival and Gorgom’s true heir.