Spoiler free
It was supposed to be something fun and different, but it really wasn't after the first 2 episodes and that's why I didn't really like this show. Of course the whole theme of zombies was new to me and I found it intriguing at the start, but as I progressed in the episodes sure the zombie elements where there at times, but in the end the focus was put to "How can we end this series?", which was done in a manner that is so cliche in the anime genre all the while forgetting about the characters which then became, funny enough, zombies metaphorically, since there was no depth to their characters anymore.
That being said the series is a few years old like most of the reviews too, so this might've been something completely new in the 2012, I'm not sure. Lets just say it didn't age well.
Personally I wouldn't recommend this to anyone if they weren't as crazy about the zombies as the main character. First 2 episodes were very promising, but all of it flopped from there.