I don't really bother to touch untranslated games but I can say it's hard to tell as several games DMM have on their top rank list, Nutaku has or 'had'. Emphasis on had. Several games didn't do well with the nutaku community and were discontinued despite doing well in Japan. Idol War Z for example, as of posting this, is their #3 which barely lasted on Nutaku. Though Kamihime is still the highest ranked adult game on there, so it's unlikely anything will beat it unless some new contender comes out of nowhere like say an adult version of Fate Grand Order or clone game of it like Kamihime is of Granblue Fantasy, which there probably is already I dunno.