Reading the manga now. It's excellent, bloody brilliant artwork. Not sure if I'll play, zombies are not usually my thing but the manga treats it all in a fairly comedic way and if the RP does the same I may be interested. Dark, serious, scary zombie nastiness isn't my thing at all though, so how to you plan to pitch it?
EDIT: Read through much of the manga last night and I love it to bits. Unfortunately right now I just can't take on any more games :( That being said this is the kind of setting where a new char can pop up at any time and in fact the part of the story that interests me most is when the characters leave the school and go outside, arming themselves with guns and getting dragged into all the politics and infighting of the survivors. If you get to that stage where the character interactions really become relevant I'd be interested.