This made no sense
Honestly I agree with you. The characters are fine and cute but it's totally obvious that the author just wanted to make a story with the "teacher x student" trope but trying to make it legal, so of course the context could only be forced... First of all it's clear that the coma was just used as a pretext to make him return to school as an adult, but the point is that this just makes no sense, because you can't have an adult of that age (22/23) who enroll in high school, like that, after years, it was just weird! Imagine if he woke up at 30, or collapsed when he was in middle school, then would he still have been allowed to re-enroll? Of course I'm exaggerating, but that's the logic, apparently.
Oh no, of course everyone has the right to graduate if they want to resume their studies, I didn't mean like that! But for example in my country there are specific courses to attend for adults who didn't graduate at the "right" age and want to get their diploma, but of course you can't be like 40 years old and enroll in high school or in middle school... Only university allows enrollment to people of every ages (but you need to have the high school diploma of course), so this situation was just really weird to me But yes, I agree with all the other things that you mentioned!
I have not read the new chapters yet, but I am already deeply disappointed reading the comments...Most of us have been following the story for years now...