I was also pretty much invested into NKNSG, but this arc really made me feel "ehh" while reading. And it's fucking 3 volumes just around this teacher (or someone close with her and mc) -_-
However, after 100 chapters, the new teacher and arc look promising (checked the raws). So, I'm just waiting for the scans to catch up to that at least. Reading this manga will probably be fun in that arc.
Thanks @Mankitsu-Scans for picking this up. Get over this trash arc soon so we can get to some good stuff (hopefully).
(By the way, the manga is currently under hiatus in japan due to author's health issue)