I feel like they cut this short for some reason.
It's like a chapter or two chapters are missing when they were found out...
It was a good ending either way.
It should have had one more volume, to at least tie up the story properly.
One of the problems with this Manga is that it did not really have a real framework story that got progressed.
The relation between him and his students only started to progress in the lost volume.
Well, it was an...