Alright, time to drop this slop. I am so tired of the Japanese and their continuous motif of the MMC constantly feeling/being inadequate, this has happened like twice or thrice in this manga alone. This isn't supposed to be an NTR story, so stop injecting that garbage in.
Practically every major arc in this story is an NTR arc. First the teacher tries to steal them, then the newly hired teacher, then now this principal. Any other brief arcs are only there to introduce a character and have little substance to them.
Every few chapters I come back, hoping the story has improved, because the art is nice, but no, somehow it's further down the drain. The mc has the spine of worm, and only exists to hold back the other characters, until eventually putting in token effort at an arc end and being praised by everyone for that.
At this point it's all but obvious that writing is not one of the skills the author has. They really should let someone else write, after all, they haven't learnt anything in the years since they started writing this.