New girls, let's fucking gooooooo! If one of them showed up, the rest of the trio of guard girls will probably show up soon. I'm also starting to notice the author really likes ponytails lol.
I hope the author keeps the flow of new characters low though; the story already progresses slowly enough as it is.
Anyway, so Class C doesn't have a male student, leaving class B and D unaccounted for (A is Suzuki, E is Sou) if we assume there's only five classes per grade. Since Kurose is being smug about it, there might be another boy in D so there's a chance we'll interact with another male student. A trio of male students sounds like a good balance of characters.
And about Kurose... I know Sou's been mindbreaking girls left and right, but Kurose seems like bad news. I wouldn't put it past her to have already (secretly) assaulted Class D's male student. Alternatively, she's either probably the most lewd or the most wholesome. We'll see!