Since there's only 4 more chapters let's hope that she disappears in the next one.
I don't know what Okachimachi bothered to answer that annoying 3rd wheel guy about that chick. They're not friends, and it ain't any of the annoying dude's business.
So a random girl he barely knew thinks they dated because he took one day to reject her? And now she's all like "what's with that? He never acted that way with me. Why is he being nice to this other classmate girl?" Even tho (again) they were only acquaintances when she asked him out not even friends from what he said