Honestly really not much of an NTR game. The MC is in love with a clueless guy, but not real wimpy guy. She gets screwed by another guy before they ever have a chance to be an actual couple. So, even when he doesn't get to be with her, it wasn't like they were really together in the first place. So, yeah it has NTR, but its pretty weak. Its more of a (forced) corruption focused game, in my opinion, with some weak NTR elements.
P.S. Some may say what about the flashbacks and how close they were? I would say its still pretty weak since they never were truly a couple due to flaws each character had.