The NTR in this is at least believable, most of the girls aren't even happy about what they're doing. They don't do a 180 personality flip based on who they're with like some NTR games.
That said, this game is still a giant mess. Both in it's writing and coding. Things happen that shouldn't or have no logic to have happened. If you send your mom to the principal, but she rejects him, he never has his fling with the teacher either, but somehow you have a picture of him doing that like the NTR scene happens.
There are scenes that have no bearing on the NTR route that only happen on that route and all content with Yuri was locked behind Ramu forcing her to do stuff. On the Alpha route, it just looks like the Dev cut the character at a certain point.
Then there's Yuri's friend she meets after exams. On the Ramu route she gets fucked, on the Alpha route they do Karaoke and she's never seen again.
Like I said, this is just a giant mess.