[v1.0] Great game overall, with good characters, sexy situations and writing, a decent mystery story line, good graphics with animations, in a VN with multiple endings. I'll be storing a copy on my hard drive for the foreseeable future and will be donating to the developer.
Sex: 5/5.
In the most important category for this site, this game performs very well. This is a combination of graphics & models, scene design, and most importantly writing. Personally, I find "taboo relationships" (teacher, steps) a bit of a turn-off, but everything was so well done overall that it was still hot and exciting. If you're looking for uncommon fetishes, however, you might need to look elsewhere.
Writing: 4/5.
Iris has basically no personality, everyone is attracted to the MC (and OK with not being monogamous) for no reason, sometimes the plot languishes while other times it leaps, the plot is a bit thin, there are parts of the story that are unnecessary and so on. However, the game has a story that is compelling enough to be interesting even without the sex, and the erotic writing would be enticing even without graphics. The humor is well done and doesn't (usually) go too far. Finally, the text itself flows well and has few (if any) errors.
Graphics: 5/5.
Not an important category for me, but still one the game does really well at. I did have a little trouble telling characters apart when I started, but got past that after a bit. The body types are all pretty similar, but they were still pleasing. The animations are some of the best I've seen.
I have some different preferences for styles and lighting, but don't feel that this should affect the score here -- everything was very well done.
Gameplay/Choices: 2/5.
This is where VN's fall, in my opinion, since the choices are necessarily few and far between. In this case, the story doesn't branch much, and is largely "do you see scene Y or not?". A first playthrough gives you some of the scenes and all of the story, and replayability at this point is a matter of rereading hot scenes or skipping text to figure out how to get a scene that was missed. The only real branching is toward the end for the different endings, but I'm happy that those are there.
In particular, there were a few scenes that were annoying to unlock because the locking choice didn't make sense until well after it was made. For example, to unlock Rebecca's final scenes, you need to have taken an LSD potion several scenes in the past, there was no way to know that was required (or related to Rebecca), and there were several other options that also could have been useful. You could argue that this increases replayability, but I found it tedious and frustrating instead. A "path lost" notifier in the path screen shortly after the potions decision would have made it much better.
Again, a great game that I'll be keeping around so I can reread the scenes.