Aebelle, a transfer student, arrives at Kuoh Academy and quickly turns heads with her otherworldly beauty. With her short white hair, piercing crystal blue eyes, and a petite but curvaceous figure, she is the subject of much speculation and admiration among the student body. Despite the attention, Aebelle remains humble and reserved, preferring to keep to herself. But Rias Gremory, the club president of the Occult Research Club and the Head of House Gremory, senses that there is something different about Aebelle. Rias, who is also a high-ranking devil, has the ability to sense the presence of other supernatural beings. She is certain that Aebelle is no ordinary human.