"Magical Girl" type games tend to have a lot of this, although most of them are obviously female protagonist, not sure if you're good with that or not. For a rare male protag one, maybe check out Beat Blades Haruka, the dark route has some of this (and so do the loss scenes).
U-Room's games also tend to go enjoy psychologically breaking their heroines, Dark Hero Party has a lot of it but it is also very NTR (the male protagonist is not the one doing the breaking). Peperoncino's games (the Goblin Burrow ones in particular) might also interest you.
If female protagonist is fine then you have lots of options. Basically though I agree with Pretentious Goblin that more information would be helpful. Is female protagonist okay? Are you interested in the girls being gradually mindbroken through training, or are you just into the psychological suffering and having them fail and fall into despair as they are raped? How do you feel about physical torture / blood / gore (a lot of games with mindbreak have that as well)?