This would have been a good manga accept for the fact that it's trying to imitate Kenkyo Kenjitsu. If it is, then it's a terrible fanfic, because Kenkyo is my favourite Villainess Noble Girl Isekai story.
With these tropes, I always see these guys having unhealthy ill intent only towards the protagonist as if guided by an evil force. It's like being forced to act like a trope.