This chapter was a ride. First, fun Christmas hotpot girls time! With some creepy elements, though ultimately nothing happened...and then a bomb was dropped: Nene's identity. What a twist! That is both shocking and sad. I think either she is actually a ghost or she got went to the future somehow. I bet she's a ghost, though...but somehow, Makube and other specialists didn't realize, probably because the university's power is just that strong.
Only 3 chapters left?! Noooo!! No way it's going to end properly with all the loose threads dropped at the end of the cultural festival arc (teacher being big bad), unless the mangaka rushed and compressed it somehow.
As someone else have said, the cultural festival arc seems like a fitting finale, a perfect place to end it. But it continued. And now it's suddenly going to end soon...
Still, I'll see it to the end. Thanks for the translations!