Holy Corpse Rising doesn't get enough credit it deserves. At the time I am writing this review, it has a review score of 6 on myanimelist. But I think it deserves more.
The story is average or above average, there is nothing special about it. What made me really like this one is the characters, especially the witches. The witches are designed to be very sexy and are drawn beautifully. There are a few nudity scenes, but nothing egregious.
It is an ecchi, manga, and a good one. At 7 volumes, it is relatively cheap to get on eBay and it is an enjoyable read overall.