Tatakau Shisho The Book of Bantorra

In a world where deceased people turn into stone-like books and are stored in the Bantorra Library, anyone who reads a book can learn its past. Bantorra Library is maintained by the Armed Librarians, who wield supernatural abilities, and their enemy is a psychotic cult known as Shindeki Church. As the story progresses it presents a world of sorrow and pain, and the unfairness and frugality of life, as well as personal desires. However, in each arc there is also a small underlying hope, and more of the reasons, conspiracies, and secrets are revealed behind everything.

Source: http://en.wikipedia.org/wiki/Tatakau_Shisho