Yeah it's funny how everyone has issues but we have people trying to demonize the main characters only, when there's the fact that Sei was being harassed by her own students just for existing and then by this girl for "stealing" his love and basically trying to get her fired...but nope, it's Sei who is troubling this girl.
And Aya finally found someone to have a real talk and do her own things but Haruki wasnt going to allow any of that!
So in short, is not the main characters that have to fuck off, is everyone else who is forcefully trying to get in between for ulterior motives and then freaked out when things didn't go their way.
Haha, was literally typing exactly this and then thought 'fuck it, will just say everyone is toxic'. But yeah Mochida is trying to ruin someone's career over jealousy and Haruki invades Aya's privacy multiple times purely because she started talking to someone Haruki doesn't know.
Tsubaki is better than her sister at everything and yet constantly puts herself down so this makes Hiiragi feel like shit, as well as the constant comparisons for being twins. Doubt there is much more to it than that.