Well, i'll be short.
The manga is your "normal" harem school life that you might expect.
The pacing of the manga its pretty good in the first 30 chapters. A lot of story progression and character development. But from the chapter 30 to 55-60 the story slows downs a bit...
My point is, its a good harem school life manga, the fact that the main protagonist is in a "superior" role as their teacher creates a lot of interesting situations. All the girls are good additions to the story and all of them have a unique and awesome personality that fits the manga. The events are also really cool. Of course, you have your clichés, but since this a study based anime the situations that the writer shows to us are pretty unique.
But, its problems are the same as in all harem manga, the story gets stale at some point.. But one thing that the writer does pretty well is to cycle the chapters so we don't feel that staleness.
If you enjoyed the first 20 to 30 chapters, you'll really like the whole thing. Just stay strong and don't give up while reading through chapters 31 to 55