Otogi no Machi no Rena

From the author of Umisho and Sankarea, which, like me, is probably why you are here. Otogi no Machi is an incredibly raunchy manga about a girl possessed by spirits that make her extremely horny.

On the good side:
The artwork is pretty good: actually, it looks exactly like Umisho, for better or worse. The main character (Rena) is fun, as is the main guy (Otogi), and some of their antics are pretty sexy and fun, especially when it's just the two of them.

On the bad side:
The manga is practically a celebration of groping and sexual assault, and at least two instances later on basically qualify as rape. And because that's the source of most of the humor, it means that most of the jokes fall flat. The romance is never satisfactorily resolved. The plot makes very little sense.

As a test of whether you will like this manga:
Reasonably often Rena finds herself getting horny. The only person around is a guy she either doesn't know or like (and also she's starting to like Otogi, though it takes her almost the whole manga to admit that to herself). But she can't help herself, so she asks that person to help her relieve her desires. Then she pushes him away and immediately regrets her actions. That situation happens often. If that doesn't bother you, then enjoy; Otogi no Machi will be a fun romp. If that sounds disgusting, then don't bother reading Otogi no Machi at all.