Fantastic game. Finished it yesterday.
With most NTR-games, personally, the most enjoyable aspect for me is the corruption of the female lead. The problem is, plenty of non-NTR games have it. And most NTR games have little to nothing to offer besides that. The reason for this is simple: the lack of likable characters in these games.
Most of the time the cuck protag is obnoxiously pathetic and you don't want to sympathize with him, while female lead lacks any kind of personality besides being a thirsty whore. Typically she starts off as a completely bland innocent-vibed non-character and serves as nothing more than a "plot" device throughout the entire game. The term plot here is in brackets because oftentimes it's nonexistent as well.
So you end up caring about neither the protagonist nor his "beloved", and are left only with the sexiness of corruption to enjoy. To this day there were only two games that actually made me care enough about the characters for the NTR-thing to hit as it was supposed to. This is the second one. (The first one is Boy Hero Ken, by the way, in case you're interested).
The main protagonist isn't just a pussy. He's actually a very sympathetic character who, for once, has something to do in this story except groveling in the emotional pain of being cucked. There's a working story and character justification as to why he doesn't try to stop his sweetheart from being stolen right away, in spite of seeing where it is all going (well, technically, he does try to stop it, that's what his goal is from the beginning, but it's not only that and if that isn't at all simple). The main heroine also is quite likable, and actually cares about the protagonist until the very end. She's ashamed of what is happening to her and believably, honestly constantly tries to soften the blow for the protagonist - which makes everything that is happening all the more tragic and, therefore, enjoyable.
The game is mostly linear, and, honestly, I am glad it is. Otherwise, it would probably not work as great as it does. In my opinion, there's always a trade-off between player freedom and competent storytelling, and the NTR games that rely heavily on characters and stories simply don't work when they try to sit on two chairs at once and give the player freedom on top of telling a ruined relationship tragedy. It's kind of like in (j)RPGs where you can choose a romantic partner versus the ones where a single romantic lead is written into the story as its own full-fledged and predetermined element. The former gives you the freedom of choice, while the latter simply makes for a better story.
Also, the game has brilliant art and character designs. Although, personally, I did not appreciate the body modification thing (breast enlargement and the pubic hair growing that eventually happens to the heroine). But that's just me. I don't like unrealistically huge busts. That was my main turn-off from the previous Avantgarde game about the elf wife (what was it called again?). I can't help but mention it because I am still bitter about it. That one also had a gorgeous character design that was wasted on huge unsightly badoonkers. And this game eventually ends up doing the same thing again halfway through with the body modification. What a pity... But I guess it wouldn't be a problem for people who like this sort of thing.
Anyway. The game is great even despite that.
By the way. I am noticing a separate Review section in this topic. I would post it there, but I couldn't find out how. Anybody can point me in the right direction? Would be useful, since I don't post anything on this forum besides reviews anyway.
UPD: Nevermind. I found it. You have to rate the game in order to write a review. I honestly tried abandoning value judgments, but I guess the world is determined to not let me.
UPD2: Oh, this text doesn't fit in with reviewing rules. Well, I guess I'll just leave it here then.