Oh god...i realised from the summery what you were talking about but the name completely threw me off, that one is call Read or Die, how did it end up being called something like "Paper Master"?
Hm i havent finished the anime, but i do agree that its quite good, i do read its 2 mangas (theyre entwisted) so i know how the story folds out as far as its been translated, curious now thou, the anime had a unique ending you say?