I was screaming at my screen telling them āIt's that girl Wakamatsu was out with in the previous chapter!!!ā until I realized these two weren't involved in that.
I hope this shoujo manga girl becomes a recurring extra, giving Nozaki even more material from her shoujo manga-esque life (which will inevitably turn out hilariously off/realistic/disappointing or whatever fits best) and Chiyo getting more and more suspicious. Perhaps culminating in shoujo manga girl meeting up with her hunky, rich, and now half-brother in a chaotic dinner with Nozaki "in the sidelines, for science" and Chiyo (and Mikorin) tailing them. All the while, Wakamatsu (who was indirectly the cause of all this mess) being blissfully unaware of all the chaos and asking shoujo manga girl how the dinner went.