王の獣 [Ou no Kemono] Series by Rei Tōma

Someone in the imperial palace is trying to kill Prince Tenyou, and Rangetsu has reason to believe it might be the icy third prince, Kougai. When things turn violent on the jiju field, Rangetsu decides to confront Prince Kougai directly—and ends up as the prize in a wager between royal brothers!

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... moreAjin 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!After years of pursuing vengeance, Rangetsu has finally found news of her brother—he’s alive! Sogetsu has been kept locked in the inner palace, where his very flesh is harvested as medicine for an emperor obsessed with immortality. And now that the emperor has his hands on both twins and their mysterious powers, he’s never going to let them go… less

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... moreAjin 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!Sogetsu may have been released from the emperor’s cruelty, but he’s not yet completely free of his ordeal. In order to survive the experiments he suffered through, Sogetsu’s mind splintered into many personalities…and only one of them made it out of the inner palace. Now he is racked with guilt over being the wrong Sogetsu, and the agony of feeling unworthy of being rescued is pushing him into unexpected action! less

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... moreAjin 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!Now that Rangetsu has her brother safely back, she can finally relax after years of revenge-fueled vigilance. But her peaceful days are anything but restful. Without the fiery urge for vengeance to distract her, the terrible disparity between the treatment of Ajin and humans has become even more painfully clear. Can she really be content to stay quietly at Prince Tenyou’s side when the world sees her as less than a person? less