As the series has gone on, it's definitely been a decent show in allowing the characters to grow and change somewhat noticeably. There's a blunt moment towards the end here as Keigo is walking behind everyone and realizing just how much Nayu has changed and the friends she has now as well as her general comfort level with so many people. It's a pivotal time for a lot of kids as this age is where they define themselves more and a lot of that comes from how other people look at them. With very good friends at her side, Nayu's discovering who she can really be.
As are other people in the group as this episode so plainly point out. Interactions with other people is one of the bigger themes as it starts off with Yako being oblivious to her childhood friend Kota and the changes they're all going through. After a sports competition, she ends up using the boys changing room along with him because something is wrong with the girls one and she doesn't even really register him as a boy. Part of it also comes from all the Underwear Society things as she doesn't view a sports bra as real underwear, or at least the sexy kind that could cause problems with a boy. But as Komachi reminded everyone recently, for most guys all underwear is erotic and that must be kept in mind. The discussion about it is interesting but it's Nayu's comments that she's found it easier to talk to boys because of Komachi that's the big point of it. They're all gaining new comfort levels because of the interactions with each other.
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