The main theme is the Z-apocalypse. Oddly enough it's the only anime around with our brain eater friends in focus, it seems like japanese people are totally scared of even thinking of having to live trough such thing on an island. Anyways, this is the main selling point of the anime, it just feels so great to see the familiar setup in an anime.
The characters are okay-ish, the protagonist has some character development (nothing serious though, from being a normal, depressed student to a reliable "leader", that's all) and Saeko is one badass chick with some psycho flavour. The others are unfortunately as one dimensional as you can get, you have the typical nerd who happens to love guns, the doctor with huuuuuuge breasts, the necessary little girl and the supposed love interest for our main guy.
What really ruins (or can ruin) your enjoyment is the ridiculous amount of fanservice. When I started to watch it I felt like I was that pervert japanese guy from those infamous TV shows which spread on the internet. All (really, ALL OF THEM, :ohgodwhy: ) the camera angles are designed to show you either boobs bouncing or panties under the skirts. Even the traditional and supposedly strict japanese Saeko becomes a total slut sometimes, just because...well, I don't think that anyone knows why, if there would be a semi romantic moment it's ruined by boobs (I didn't think it's even possible o.o ) or crazy dialogues.
In the end I'd like to say it again, it's an enjoyable anime, really. But the setup and the atmosphere of the first and second episodes makes you think that "hell yeah", only to make you go "oh god, please don't do this to this awesome stuff". If you want zombies go for it, if you want harem and boobs, then great, you've found the paradise, but otherwise I'm sure you can find something better (but again, if you want zombies you have no other choice).
