The rest of Summer Break breezes by without any contact between Momo and Yuki after accidentally ending up so close together. It wasn’t a matter of Yuki not liking it, but liking it too much and not being able to withstand any more. As a result, Momo is a little confused by their distance when the new semester arrives, but a nervous Yuki is later comforted by the fact that Momo not only worries about her, but is willing to call her to make sure everything’s okay.
Norika and Sawaguchi have a nice sidebar wherein the latter notices Yuki’s stalking, but comes to Yuki’s friend instead of Yuki directly, showing a degree of tact and delicacy. Norika is impressed by this, but as easily as Sawaguchi was able to detect Yuki’s bizarre behavior, he has a much tougher time reading Norika, who I feel genuinely believes he is a nice guy, even if her vitriol-spewing gives him cause to doubt it.
Momo invites Yuki to a date at an amusement park, and the two have a grand old time, eventually ending up at the haunted house (where Yuki wants to hang off of Momo’s arm). A fortuitous power outage gives them both far more than they bargained for when Yuki trips on Momo, falls on him, and her hair gets tangled on his sweater button.
The house had legitimately made Yuki tremble in fear, so Momo’s correct and natural instinct is to hold and comfort her, which is what he does. Momo is surprised she’s more receptive to being held after running off and not being heard from the rest of the Summer, but due to the button entanglement they’re both in a situation of forced intimacy, and neither really has a problem with it.
After they get entangled and Momo sees Yuki home, he crosses paths with Rio, who we know full well is jealous of Yuki, something she may only just be starting to realize when she gets to sit down, mend Momo’s sweater, and simply comes out and says things one could construe as critical of Momo and Yuki’s relationship.
Specifically, Rio sees Momo keeping a distance from Yuki, putting more value in his absence (and the trinkets he discards, like his button) than his presence, since his presence is often so overwhelming. At the same time, she sees Rio looking at Momo but not really looking.
What she really sees, jealous googles or not, is that Momo and Yuki are still fumbling through the basics of romance. Like Rio herself, neither of them have the slightest clue what they’re doing, and continue to put up walls when things get too intense. But there’s every indication, especially taking into account the progress they’ve made thus far, that they’ll figure it out eventualy.