digging up old thread again... watched this anime 1 or 2 years ago and recently started reading on the light novel. the light novel has more in depth plot and explains more on the war between the censorship board and library, but of course this is expected from a LN. However, i must say that the story in LN is very well paced and well plotted. If to compare with the anime, i would say the anime only touches on the relationship between kasahara and doujin, and the LN really brings out the whole situation into a real world. Moreover, it also shows how capable the Special Task Force is when dealing with all sort of situations.

a highly rated LN series if you have the time to spare to read it.