I know you made this comment a few weeks ago but I was reading all through this thread when I saw this game and it's been said by you and others that the MC isn't actually dating any of the women.
If so is it really NTR? I'm somebody who doesn't care for it but to me that just sounds like a player going around fucking sluts.
Especially if some of the other girls are in relationships then it's the other guy getting "NTRed".
Correct me if I'm wrong and the game is actually hard NTR. You'd be doing me a solid.
Looks like you got your answers a few times, but I'll add a little more to it. Yeah, it's a college game, so you are going around banging everyone. However, some of the main girls can start to catch the feels for you, you're just not officially in a relationship yet. It's not as obvious as a game focused solely on romance, but it is there.
Look at it this way... the MC gets out of a relationship at the beginning and, despite this game being out for a while, not much in-game story time has passed. He's in no rush to be in a relationship just yet.