I do like the whole concept of Zombies. Its pretty good for that. But its too Fan Service based. There are so many boobs and panty shots that I'm getting annoyed. There isn't even one image of Takashi topless. The least they could do is even it out a little more. Too much of a good thing can be bad.
I do find Saya-chan (the brainy one) to be annoying at time's. I wish she wasn't around as much. But I guess there is always gonna be a character that no one really likes that much.