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 isn't the only person in the imperial palace with dark secrets. Prince Kougai's beast-servant Boku knows something about Sogetsu's final hours, and his confession shatters everything Rangestu thought she knew about her brother's death!.