I gave the game a try again after playing it for the first time two years ago, and got farther this time. First things first, props for still going at it! And congratulations on the characters, I feel a lot of them are really well done - not only the mains, but even background ones like Rina (?) who seems like just a dumb bimbo yet does seem to care for Mai. The choice/dilemma you make the player face when it comes to Haruka - sharing or not the photos after the fake scandal - is so well done, congrats on coming up with it! Props again!
Now, this is a very minor suggestion you can feel free to ignore. At points, I found some student had gained strikes but I just wanted to forgive them rather than trade them for corruption (Satsuki for example, when you are given the option to strike both her and Rina). Only very later on did I get a random event for someone to give them extra work, to remove the strike and improve their grades in exchange for student trust. Imo, it would be nice if "forgive strike" was an standard option you could select - gaining student trust in exchange - when you summon the students to the office, below punishment, so you don't have to rely on getting a random event to forgive it. Again, not anything major, but it may be a slight QoL improvement to have.
One last thing, which I'm not sure is a bug or not. When it came time for the first exam, I called out Rina, gave her a strike, and a 0. I allowed both Ayumi and the boy to retake their exams (and rejected her offer to flash me.) Now, when the weekly reports came in, Rina correctly showed as scoring a 0, and Ayumi a 100 while the boy got a 55. Yet the next time Ayumi talks to me, on the conversation that has the option on if to enable/disable NTR with her, she says he's asking for money since he couldn't retake the exam, and so didn't get paid - the bathroom conversation, where he gets money from her after rejecting the NTR path, acts as if that were the case too. Is that an instance where variables got mixed up behind the scenes, or is it simply that a scene where he is allowed to retake the exam doesn't exist, since it's necessary for her path (weird to give the player a choice on it if so)?
Whatever the case, best of lucks with development!