Long ago Demons and Angels fought over 3 gems, the Gem of Desire, Restraint and Reason. Demons now hold of the Gem of Desire and Angels hold of the Gem of Restraint while the Gem of Reason was left on Earth. It was later shattered into 5 parts that reside in 5 humans. Akashi Heir to the Underworld and Kuroko Heir to the Heavens are both after the Gem of Reason. Who will get it?