Beware, this is not a game its a visual novel/scene collector at most, its basically porn, there are essentially no gameplay elements in this except for walking from point A to point B.
This is a really good porn work, not a game at all, if you want gameplay or a product you can invest 10 hours into, this is absolutely not for you, if you are in for a quick wank, and the corruption setting/cg is up your alley, this is for you.
About NTR: It exists but you see through the male lead's eyes like twice/thrice scenes throughout the entire game, the rest is from the FMC's POV, she sometimes says stuff like "I'm undeserving of the male protagonist/my fiance" but that's about it.
The game, despite being built upon the "NTR route" doesn't really focus on NTR, its a corruption work at soul.