Did it say this "A short, linear erotic visual novel with heavy NTR theme" when you wrote the comment?
As I learned , ntr could also just mean cheating lots, but here I only see it as synonym for cuckold in the sense that the cuck does know and often likes it as a humiliation fetish.
I would have stayed clear from this because of linear vn alone. I do not dig those kinetic novels most of the time.