A simple, well done game with high quality art and animation, but 2 major flaws: 1) The English version of the game is broken as you're unable to start the sex scenes. 2) The final condition for getting a girl to max rank is extremely vague. (Bring them to the verge of orgasm then stop moving 3 times and it only counts for penetrative actions.)
Other than that, the game does a good job of setting up sexy scenarios, has good art and animation that scale well on higher resolutions, good voice acting, just enough gameplay to keep you thinking without bogging things down and is generally an enjoyable hour or two. So wait and hope for a patch to fix the bugs or read the opening then save and switch to Japanese.