The main theme of the game, and a vast majority of scenes will be "This girl you like is getting her back blown out by a whole bunch of people you don't know, where you can't see"
If you can see those scenes and think "ah, but she is not technically dating me, therefore it's not ntr, and so i will enjoy other people fucking her" then...well, honestly I would love to study your brain under a microscope, because I find that perspective fascinating.
For the vast majority of everyone else, what matters is: "There is a heroine, having a lot of sex with people that aren't the protagonist, to various degrees of increasing consent"
That's what I like about it, and it's likely what you won't like about it.