Huey’s grandfather was an enthusiastic bibliomaniac who once spent, half of his wealth on a single rare book. Huey just inherited his grandfather’s antiquated mansion and the collection of books within, however there is one condition. He must also take over responsibility for the Bibliotheca. Huey arrives at the mansion to sort through his grandfather’s belongings, and in the cellar that is filled with stacks of books, he encounters a young girl who is quietly reading. The girl, wearing a black dress, is hiding a large lock on her chest. The lock is the door to the Bibliotheca of Dantalian, a repository of forbidden Mystica, and the gateway to the knowledge of demons…