Actual Factual Backstory for Wakao should be interesting.
Gonna go out on a limb and guess she's very tense about the prospect of running into middle school classmates (what with no expressions and all).
But the fact that she was frowning so much at Mizuno being constantly flirted with and fussed over by all the girl guests at the cafe..........well, between that and her little "moe moe kyun" moment with Mizuno's sandwich, I think the romance angle between them might finally be kicking into gear (yes, yes, she's been blushing every chapter at something he's done, but this is I believe the first time someone else has caught her expression or demeanor/behavior when it pertains to Mizuno). So with them both going around the festival together in the pt.2 next chapter, I kinda hope we get something on that front (even if it's a thought bubble to put her feelings into words).
Thanks for the TL.