Goddess Kiss is such a free slam dunk that I can only assume that DMM is still wary of working with Nutaku. The all ages version is already available in English, only the H-scenes/mechanics need translating over, it would be so easy. The developers are clearly okay with their IP having an adult version, and they clearly don't shun westerners because the game has been out in English for over a year. It's such an obvious choice that I can't imagine they haven't tried for it already.