Hesitated between 4 and 5 stars for a while, but I'll give it a 5.
So the positive stuff;
-The game is immersive enough. There isn't really a plot, mostly how each character is conflicted about the MC, so if you like that, enjoy.
-The CG and animated scenes are pretty great. Good detailed put in, well rendered.
-The game comes with a lot of functionality that I wish other games had; you have access to a journal to tell you where you are at on each character. You have access to all unlocked scenes to replay at your leisure, as well as pictures you've unlocked.
The negative stuff;
-There is a bit of discontinuity in the "plot", but it isn't to bad. It's mainly the MC that goes from "Aw yeah I wanna do it with everybody" to "Oh no I shouldn't be doing that.", but I guess that's part of the fetish, so to speak, the tabooness of the thing.
Overall, pretty good game, definitely worth a play, can't wait for future updates.