有些怀古风味的街道·四皇町住在那里的立华律香，是就读四皇学园高中二年级的少bbb她一面期待着英国留学的哥哥·林多偶尔的联络，一面和母亲一起度过着平稳的日常。某天，她被学园的学生所憧憬的学生会长·钩贯雷姆叫了出来，在学生会成员集合的“第三图书馆”与他们展开了不可思议的邂逅。恶魔、吸血鬼、驱魔师。围绕着“禁断的魔导书”，各种思绪以她为中心开始转动——是人，还是恶魔？这是，被魔所魅惑、被魔所爱的一位少女的物语。

Lihua Ritsuka, who lives in a nostalgic street Shikocho, is a girl who is a second-year student at Shiko Gakuen High School. While looking forward to the occasional contact with his older brother Lindo who is studying in the UK, he spends a peaceful day with his mother. One day, she is summoned by the student council president, Rem Katsuki, whom the students of the academy yearn for, and has a strange encounter with them at the "Third Library" where the student council members gather. Demons, vampires, exorcists. Around the "forbidden magic book", various thoughts began to revolve around her—is it a human or a demon? This is the story of a girl who was charmed and loved by the devil.