This game is pretty good, for its genre at least. The graphics are completely focused on the girls, of course, where they're moving models on mostly static backgrounds. The gameplay is pretty nonexistent and some of the girls are rather stereotypical, but as this is a dating sim, I didn't expect much else. You play as a male tourist on a paradise island (reminds me of Dead or Alive Xtreme Beach Volleyball) who tries to get girls to like you. The effort is very minimal, though; all you have to do is take the girl on dates, and there's really nothing you can do wrong that will make them like you less. There's no issue of jealousy or anything between the girls, which is interesting and either lazy or an intended feature. I'd like to see the girls reacting in different ways to different things (and not judging how comfortable they are with you simply based on how many dates you've gone on with them). I'd also really love more areas (or maybe just more ways to explore), because the ones that are currently available get dull fast. As an aside, the English translation makes your guy into a complete 4chan nerd, making crappy references all the time. It's actually really irritating, but I just began skipping past whenever he talked anyway.
The game, as you can expect, does get quite into rated R territory. You probably have to like this type of game to get into it at all, else I can see you hating it due to the lack of actual gameplay (think Dead or Alive Xtreme Beach Volleyball, but with easy sex). There's even an unlockable Kasumi costume available for the girls.
That said, Esk is my favorite.