Only having read Volume 9 and that a while ago, this remains a bit of a mystery. It takes place in a school where privileged students attend amongst others and the school exerts power and influence over them and their families. I read a little of the synopsis from the eight previous volumes to give me some idea of what had already transpired. The students are imprisoned in the school, brainwashed on the whole. There's a fair amount of bloodshed, death and betrayal as well as outright lunacy.
The writing is pretty good and engaging but there are too many flashbacks which makes continuity a problem for me. The artwork is good although I sometimes found it hard to remember which character was being portrayed. I wish that I could say that I knew more about what is going on - not sure that I can.