Wow, what an ending. That was definitely worth finishing. I can't believe some people thought the ending was bad, I think it was great.
This is a very interesting manga, with a unique premise, likeable characters, and unexpected plot twists. I recommend it. It has occasional nudity and very infrequent illustrated nipples; more often they're obscured by hair or steam. For a zombie manga, it's not ridiculously gory, though there is some gore. Probably not for the faint-of-heart. I liked it a lot, overall.