What's interesting is that the games heroin e should have appeared at end of chapter 4, MC has been freaking out because she's not at school summoned the spirit that was meant for her and heroine has also been missing out on events
Yeah I remember back at the end of chapter four when the MC was freaking out that she wasn't there since then there's been a few more times where the heroine has not been at school and she is such a magnet for events that I think the MC would notice.
My guess heroine is a reincarnated who's only interested in the male lead, I think she only joined to get close to the hidden character, just my guess
What's weird to me is she didn't appear since the start of the academic arc in chapter 4 it's been really messing up a lot of the MC's plans and the heroine must have missed a lot of event's. Scummy prince is scummy as usual, but the others seem to be pretty close to their gfs