nah, fam. that ain't gyaru. that's what we call minefield girl (forgot the japs word for it).
Jirai-kei would be the terminus technicus for that one. Was already mentioned, though.
But lets wait how she really is. This one's the grade number 4, so she's skilled for sure, and I wouldn't be so sure that she's actually an overly nasty one. She seems to have some beef with Aya but that could very well be the normal rivalry between all guard team leaders, since they are all high-ranked.
But this is pretty much like one of my possible what's next options:
- Class C guards team shows up because they have nothing to do (their guy plays hooky again) and they are wondering what all the ruckus is about - aaaand we get the next class exchange in motion for Day 4 (Miku will be seething)
Okay, it's Class D but I'd bet, the rest kinda fits. Might be that Ruri's colleagues and their escort target are close by and all will be shown next. But what's for sure is that Ruri doesn't know about Sou yet - and she doesn't even remember Suzuki's name (Aww, poor guy), so she's in for a fastball, once that locker opens.
And Ruri also doesn't know about the class exchange yet either. I'd bet quite a sum that she and her team will instantly go to the teachers office and apply as well.
Well, unless Miku hears about it and buries them behind the gym or something.
Hm.
Kaede mentioned Class C in particular, but Ruri is from Class D, so we don't know how her view on their guys for the time being. It's likely not the best, since most guys tend to skip school or act nasty towards their guards (or girls in general). But we will hopefully know next chapter.