There are actually a ton of these games that are translated unofficially. If you go to the ulmf forum you can find alot, and some guides on how to translate (Don't worry, it is very easy!)
You must be registered to see the links
I really like one you will find on page 2 called muchi muchi, about a very beautiful, but sexually oblivious girl who gets into situations where people take advantage of her.
These are all unofficial translations however, and some are poor and not completed.
For official stuff have a look at mangagamer.com. Most of those are visual novels, but I do know the rance games involve alot of rpg elements, but without being rpgm games though.