Ch31: This Madoka teacher lady has only appeared, like, once and briefly before, and there is literally no build up in between (because all screentime is spent on Tae's interactions with the gradeschoolers), and now one mention of a childhood promise and that's it? If one only reads the summary that could be an okay end content-wise, but storycrafting-wise it's totally shit technique, which is totally out of place seeing how the author has decently done the prior parts of the story so far. Therefore the only explanation is that the Axe has been raised and on the way down.
Stories with large age gap and characters fully aware of the problems in their progress like this are fine to go either way (double down with the age gap couple, or introduce a new love interest of legal age, or the middle ground, timeskip), but let it build up properly, goddamn it.