Which version of the game you choose to play is up to you. The older version currently has more content, but it has been abandoned and will not be updated again. At the same time, it is more difficult in the gameplay. On the other hand, the new version is easier to play and it has less content than the previous version, but it will be updated.
Regarding NTR, it depends on your personal definition of NTR. Some players consider the contents of the previous version as "Not NTR at all", and others consider this amount as "too much". So it depends on you. But in response to you, I must say that some of what is considered as NTR in this game is unavoidable (at least in the previous version), but the rest of it is avoidable based on how the players play. In the new version, based on what has been published so far, no content has been published in this category.
If you haven't played this game before and you don't know anything about it, I suggest you to use the new version of the game.