At first glance this anime seems… weird. For some reason people are killing people for the sake of protecting books. But in reality, it is so much more than that. This anime explores censorship and human reactions to potentially life changing events.
More than those great overall themes, the anime can be just as enjoyable if you prefer to watch it for the characters. Kasahara (the main female character), mentions near the end of the series that although she couldn’t remember the main plot of one of the books that she loved she could recall everything about the characters she had read about. Their lives created a side story which she enjoyed even more than the main one. I believe the point she made is very true about Library Wars. The overall plot is great by the time you get a few episodes in and have gotten over the fact that they are fighting and dying for the sake of books. However, it was the side story of the characters and how their relationships evolve over the course of the anime that made the story truly rich. Because of the characters you start to root for the Library corps. Because of the characters you realize in a low-key way how war effects soldiers and how even the enemy is human.
If you are looking for an accurate description of the atrocities of war this anime will not fit what you are looking for. However, if you love books, art, and freedom of speech, or if you just want an enjoyable anime with an interesting plot and characters and don’t mind a bit of a slow start, Library Wars may be for you.