Kore wa Zombie Desu ka? Ends at 18!
Judging by the amazon.jp comments, this is indeed the case. Volume 18 is the final volume. Hooray!
Yes, there is a “Volume 19” announced for June, but judging based on the description it seems to be an extra collection of short stories rather than a proper volume. So I’ll still consider 18 the end.
By the way, expect the Vol 6 prologue to be up by the end of the week.