Looks like it's going to end since there's not really much else you can go on from this point.
I agree. and as a comment above said, it kind of is going the kodomo no jikan route, which is fine. As at least this one has a much smaller age gap, and it makes a bit of sense. The teacher in kojika went from wow, that beautiful woman, how hot - oh, she wants me? - better mack on the child instead. So it wasn't that internally consistent. He re-met her when she was only 16, too, which, contrary to appearances, wouldn't be okay for a teacher to do in Japan. Or not in any prefecture I know of.
In this one Mimika has always loved Yuzumori-san. They've discussed everything together and they're on the same page. But Kaede is too young to be Mimika's girlfriend yet.