 If you liked
Dantalian no Shoka
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 ...then you might like
Biblia Koshodou no Jiken Techou
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The atmosphere is quite different; DanBib is more of a horror/fantasy story, while Biblia Koshodou is set in our normal world. Despite this, they both are stories about mystery and books, and very captivating. I'd say that Biblia Koshodou is pretty much the josei/real-life version of DanBib.