That really all depends on whether you are familiar with the real definition of NTR, or the screwed up one that some people mistakenly use.
Some people mistakenly believe that sharing is netori, and it is not.
Some people think that if they have a harem and the girls are fooling around with each other, that it is netori, it is not.
Some people even think that if the girl had ever been with another guy in the past, that it is netori, it is not.
There is none, by the true definition of netori in this game.
There is no sharing in this game.
There are cases of the girls fooling around with each other.
No one has yet said that they were a virgin the first time, and some were sexually active before they met the MC.
No other men screw around with the girls after they join the harem, at this time, and NTR is not something planned for this game.