it is not fully ntr but the fact most of the girl had some kind of intimate relation(more than just "know each other" such as handjob, oral, dry hump etc.) with mc rival before mc came is bothering too much and when progressing with them, first thing they do is compare mc to mc rival, than:no..what i'm saying is it isnt as NTR focused as they say..its fairly balanced so everyone has a path to follow..its a good game that way and wouldnt be fair to chase potential players off if they thinks its just an NTR game.
1st one wrong move the girl will friend zone or hate mc.
2nd the sex scene that available at the very start is mc rival have sex with potential heroine.
3rd mc rival can have harem with all the girl as for mc can not must scarfice 1 or some girl.
4th the girl so obedient without asking "a b c" when become mc rival girls but when become mc girls and mc neglect 1 thing the girl will hate mc.
5th the girl scream loudly and ahego when have sex with mc rival but when with mc it is not.