The young man Huey took over the old mansion of his deceased bibliomanic grand father as well as the book collection that's stored in there. But there was a condition: he also had to inherit the "Bibliotheca." 
When he inspects the mansion, Huey discovers a cellar filled with piled up books. In the midst of them he comes across a black-dressed girl who's silently reading a book. She's called Darian and has a big lock hanging in front of her. She herself is the entrance to the "Bibliotheca of Dantalian" which contains the prohibited "Phantom Books." 
(Source: MyPersonal-scan-)

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.

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. 
"Gensho (Illusory Books)", the prohibited books, endanger the balance of the world, but people are fascinated by the taboo. Hugh and Dalian solve the cases involving Gensho with their ability to access the Dantalian bookshelf.

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