I love the concept so much more than the execution, at least in its manga form... 
 Library Wars imagines a future in which the Japanese national government censors "offensive" literature. To combat this attack on freedom of information, the local governments have created special Library Defense Task Forces. The story focuses on young recruits to the program and their mentors as they begin training to defend - with violence, if need be - libraries from censorship. 
 Sounds fairly brilliant, but this is a girly manga that spends the majority of the time analyzing the male/female dynamics and dreamy images of the male protagonists. Boo. However, the manga is an adaptation of a series of young adult novels. Perhaps those are more fulfilling, though I've yet to see them in English translation.