In short, a masterpiece in the unfortunately very niche psychological thriller genre.

One of the few mangas where actually every action makes sense from each characters viewpoint.
Additionally, the author manages to keep it interesting throughout and not slow down by fillers. He is just getting more extreme with every chapter as the students try harder and harder to get rid of the teacher.

With only 15 chapters out as of the time of writing this, it has already crafted a rich backstory with the darker aspects of human psychology at its core.
This certainly is not for the usual target-group of mangas and many will simply not even have the knowledge to be able appreciate it for what it is, but this does nothing to deter from the immense effort put into this piece.

This one will develop into a hidden gem for sure.