Miyoshi is basically that joke where they're just "really good friends" but she's such an airhead, that she actually does just think that they're just the best friends ever, but also she's definitely 100% in love with Ayano.
My prediction is that she's 100% in love with Ayano, but is terrified to take the risk of confessing because she doesn't want to lose Ayano as a friend.
My prediction is that she's 100% in love with Ayano, but is too much of an airhead to realize. I'm afraid we would need an "epiphany arch" kinda thing to have her realize she can't go on like this. Like, a guy confessing to Ayano.
Which would be hard, considering that aside from Earl Sandwich and a few other odds and ends like that, as far as I can remember there have been exactly two guys in this so far, both of them gay, both of them married (to each other), and an idiot couple to boot, so not that likely to be confessing to Ayano.
I seem to recall there was a chapter way back where Ayano was talking about some male clerk at a store who hit on her and Miyoshi was somewhat fixated on it.
Is this mini-chapter supposed to have a title like the others? Right now it just says Chapter 274.1: Mini chapter 59 in the list. Is "Misugi" supposed to be the mini-chapter name?