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!

Rangetsu loves Prince Tenyou deeply, but she knows an Ajin beast-servant and an imperial prince can never be together. The best thing she can do for both of them is return to her rural hometown. But months later, Rangetsu has a sudden surge of hope when Taihaku arrives to drag her out of retirement to help Prince Tenyou achieve his lofty goal of improving the lives of all Ajin. Is there a chance for their love after all?