This show has been an incredible mess of a situation from beginning to end. So, I guess it is no surprise that the finale has not resolved anything whatsoever. It is fitting that they are all just wallowing in an indecisive smoothie of misery that is entirely self-made. It is exactly like Naori said:

Honestly, I kind of want nobody to “win” and for them all to just grow up and find other romantic interests in their lives. I mean the professor or this chess senpai both seem to be able to hang with Naori’s quick wit, so why not give it a shot? As things are now, I expect a world of drama and pain in Jun’s future. There will be lots of this going forward (@rikka@ani.social):

I looked it up and there is more story to go, but I am not sure I can bring myself to continue this one. So, this will forever remain an unresolved pot of love pasta in my brain.