I've been re-reading some of this to catch up to the latest chapters, and I noticed two things.
One: The author throws in a fair amount of things that he'll mention or use later, like Inuyashiki's catchphrase being related to a later chapter's events, Jiiya and Baaya's relationship as sisters, and some other things.
Two: If these panels are correct, then it seems Ayatani Makoto (the swimsuit teacher from chapter 20) may be one of the guardian miko who appear in chapter 26. Just compare these two panels. The one on the far left has the same hairstyle and hair ribbon as her.
https://mangadex.org/chapter/34580/12
https://mangadex.org/chapter/34652/19