In a world where beast people live, Coco, a rabbit girl, begins working as a maid in a mansion. The master, Lucion, is a handsome yet lonely wolf who is feared by everyone around him due to a condition called "Beast Devolution," which makes him more beast than man. Though Coco serves him the best she can, Master Lucion's heart remains tightly shut. But one day, a scent emanates from Coco's body, which greatly attracts Lucion... (Source: Hakusensha, translated)