basically what he said, Davide is basically the eric of the game, but you can turn the NTR setting off, for not allowing that stuff to happen. But there are mode's for it too, think of it this way. non-NTR mode = your path/girl(s) of your choice, aka easy mode. NTR mode = Hard mode, with Davide out to take em all supposedly. BUT before the pitch forks and torches come out, allow me to get the super soakers.
UNLIKE most other NTR games, there will be ways of you getting RID of said people that steal the ladies/make your life hell. And you can have the girls back as your choosing. Thus unlike NTR with them lost, you can 'save' them, or basically use them as you see fit. So in reality, it's legit basically easy vs hard mode. Non-NTR vs NTR with some revenge factor.