Just finished the game. The NTR tag is underserved. There is no Netorare at all.
A) There really isn't a protagonist to be NTR'd.
B) None of the heroines are in a relationship with anyone.
C) The only non-villain male character doesn't harbor any special feelings aside from camaraderie and normal lust (as in wanting to have sex with hot women) towards any of the female leads.
D) Said non-villain male character ends up getting all the female leads as his personal harem and having an orgy with them in the ending.
E) Aside from all that, the same non-villain male character also doesn't show jealousy, hate-boner, nor is broken hearted upon seeing the female leads being fucked by the ugly bastards. In fact, all he shows is genuine concern and a worry over their well-being as he maintains a level head and calmly works in a way to save them-- which he does.
Now, all the female leads seem to have the hots for that single non-villain male character, even commenting that they wanted to give their first times to him upon being deflowered by the ugly bastarts. However, the non-villain male character didn't really seem to care that they fucked other dudes and neither gave a damn that they weren't virgins. He also didn't seem that interested in a serious relationship and his reaction upon the reaching the ending ammounts to "Yay! Free pussy!".
So, yeah... This ain't NTR, not by a long shot. Pretty average game that approaches some rather unique fetishes, but nothing too extraordinary. And no, the art isn't AI.