Dantalian no Shoka

Hugh Anthony Disward inherits an old mansion and a personal library from his grandfather. In the basement of the mansion, he meets a mysterious girl Dalian. She is a Dantalian and a gateway to "Dantalian's bookshelf", which stores the prohibited books of the demons.

A mystery at a prestigious girls' school draws together Dalian and Priscilla, an impoverished aristocrat's daughter. As they attempt to solve the mystery concealed by the school, Dalian gets to experience "every day school life"