I don't know what you have heard but even in the old game if you turned off NTR the NTR was indeed turned off. The NTR rivals did exist but they just never had any opportunities and/or motivation. The NTR when turned on only existed when you worked very, very, very, very hard to make it happen like rejecting sex from your girlfriend for days on end, cheating on her and letting her find out, or straight-up trading her to a prison boss so that you could have an easy time in the clink. So it wasn't as if it was a minefield of NTR trigger events so much as playing your MC like a total asshole. There isn't any NTR in the new version yet, but from what I have seen of how you can treat Miru I expect that it will be similar in this version.