In the Dark Age, human kingdoms had to offer women as tributes to please the Urekai. Princess Emeriel disguised herself as a prince from childhood to survive. But to save her sister, she willingly became a slave to the Urekai, only to discover she was a rare "Siren"—a woman capable of mating with a beast. Chosen by the High King Beast, who has been berserk for five hundred years, she struggles to survive amidst fea……