There's a LOT of tonal dissonance here. Also yeah, I agree, Imp is totally getting cock-blocked by Amona's summoning. I wonder if that's why He's so insistent on all the H tags now?
In reality what Julios said is correct, and the meeting honestly had very little substance to it nor tension. The invitation to "join the revolution" is more a decorative term than literal in that he wants to change the education system; something that Sensei is already actively doing by...
people seem to be evil just for the sake of it. And not just evil, either, it's comedically evil. I feel like that cheapens any interaction because you can physically TELL some of these characters are written with "BITCH" stuck to their forehead. Not to mention the fact that the author rips this...
If you've read up to the most recent chapter, what are your thoughts now? I personally don't think it fits any of the stereotypes you've listed (but again, for a shonen it does also get a little too real with the sexual and child abuse)