A smoldering tale of romance and revenge set in the world of the New York Times best seller Dawn of the Arcana!Ajin boys who show signs of special abilities are conscripted to serve in the imperial palace as beast-servants—status symbols and shields for their royal masters, to be kept or discarded on a whim. When they were children, Rangetsu’s twin brother Sogetsu was ripped from her arms and sent to the palace to attend Prince Tenyou as a beast-servant, where he quickly fell victim to bloody dynastic intrigues. Now in a world that promises only bitterness, Rangetsu’s one hope at avenging her brother is to disguise herself as a man and find a way into the palace!With the battle against Rohan finally over, peace is restored, and Rangetsu resolves to become intimate with Prince Tenyou at last. But when Prince Oushin decides to abdicate the throne, he triggers a duel of succession between the princes. Who will become the new emperor and lead the country into its next chapter?