Note that this game is pretty long, and appears to be inspired by wizardry from my understanding. I'm almost done with act one and haven't seen any real intimate scenes much less NTR save a mission where we have to save some village girls from demons; but then again haven't used the wiki.
The Japanese wiki has a guide on NTR avoidance for those people who keep asking; just use google translate (NTR is unavoidable for some chars)
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I think NTR comes in 2 forms (not there yet in the game). First is when you invite males to join your team, if they share a room alone with a teammate their romance goes up until NTR. Second NTR would be when you lose a dual with another party they can steal a teammate from you (not sure if its time based; or until you dual and win her back)
Also lewdness goes up for the girls if they wear skimpy clothes. You can improve your relations with the girls by sleeping in same room; eating their favorite food with them; and by talking with them at the inn.