Naja hates everything and everyone. She is the number three assassin of the organisation she works for. She doesn't know who her boss is, doesn't question why she has to kill, doesn't feel anything... other than hate. Well guess what, Naja?
Other than "loving" the main character, I got to a point where I lost my interest in the story too, and it's really a shame since I loved it at first. Nothing is explained in the first half, it all seems very random and while I am sure it gets explained (hopefully) later on, at that point I couldn't have cared less.