For all it started out as Miyagi as the assailant, and Sendai as the victim (a la Aya and Marika in AriOto), it's surprisingly clear a few chapters in that Sendai is interested in Miyagi, even to the point of pushing her way back into Miyagi's life after she decides to cut off their relationship when pushing a bit too far over the line. If anything, the more that we see, Miyagi is the one constantly running away and Sendai is the one doggedly chasing her down until she gives up. They're both pretty shitty people in their own ways, but so far from what I've read, it feels like they're just two lonely people who had the (mis?) fortune to meet a kindred soul to fill up the void they have outside of the classroom. I've enjoyed seeing their dynamic changed from the inital impression I got.

That being said, I swore this author had a bit of a foot fetish, in the beginning, but that died down in about 15 or so chapters. Who knows if it'll come back after chapter 35. (update: it did, but it's a lot less frequent than the first time around...)

At this point where I'm at, they've finally had their first kiss after a lot of anxiety, but haven't acknowledged a relationship past Miyagi's stubborness against calling each other friends (Sendai thinks they are, at least. Or at least she did before Miyagi said they weren't a few chapters prior).