Reveiw as of version: Pt.6
This game is a visual novel with a lot of player input in the form of choices. There's an outstandingly rich set of variables the player affects with his choices.
However, they're also greatly underused and despite the complex structure the dev implemented, right now it boils down to "love" and "friend" points and a couple switches to open/close certain paths.
In the visual department, the renders are awesome, the locations are fitting, appealing and very high quality and the characters look, mostly, realistic, not just because of image quality, but because of being realistically proportioned.
There are however some slip-ups with characters designs like McNab having very short hair (growing after a shave) in some renders of a scene and also having his old short, but still longer, hair in other renders of the same scene. I also had the impression in several occasions that girls chest changes in size depending on what clothing they wear.
Lastly, the bit in which characters don't look realistic is nipples/areola. All girls have very tiny nipple/areola regardless of their breast size or situation. In a way that they look only reasonable for girls with tiny tits (which isn't the case for any of the girls) or if they felt really cold, which could be the case at some point, but certainly not in every situation.
Regarding the sound, others have commented on the good music of the game but my experience is that, aside of two specific scenes at a club in which fitting music plays, the rest of the game is entirely silent. No music and no other sound effects despite they're in the game files.
As for the narrative, it's by far the best and also most cared for part of the game.
The story feels a bit chaotic because there isn't a clear (or even unclear) goal or route for the MC and the story has often severe, long and not too well explained cuts (from scene to scene, weeks may pass inbetween).
But aside of the lack in direction and understanding of the progress, the characters are deep, intricate and realistic. Even at the most difficult part for these kind of games: girls accepting the harem situation. They all have well established and told pasts and it makes it really easy to empathize with them. The story is very compelling in this sense and makes you want to know what's going to happen next.
Finally, when it comes to the lewd scenes... They're probably the worst part of the game.
There are only a handful despite the great size of the game both in GB and in lines of text. There's also very little "intermediate" scenes. Characters interactions are either slice of life scenes of people having common daily interactions used to develop their characters and building the story with very mild flirting on occasion, or openly offering sex out of the blue and having sex. So, it's not just that the lewd scenes are very few, it's that there's no sexual tension built between the MC and the girls.
Also, the sex scenes themselves don't feel realistic. In comparison to the rest of the narrative, they're very shallow and simple. To the point that they have awesome animations and still aren't too satisfactory.
In my opinion, this visual novel is like a very good conventional movie. Great picture quality, great story, great script and an the occasional, very plain and simple sex scene that's by no means the focus. Meaning, this game is awesome, but certainly not a "porn" game.
Given the established mechanics and narrative, if the dev wanted to improve the lewd department, I think the best way would be to allow the player a small degree of navigation between major scenes to include optional encounters with characters that were heavily dependent on the choices made so far and might include the typical "Oops, sorry, I didn't knew you were taking a shower" kind of scenes to add some lewdness inbetween all the drama, build most-needed sexual tension and providing interactions with characters that at this point feel left out, like Viridiana and Ines. Especially considering the story puts Viridiana at its very center.