you are forgeting all the girls except maya for sure on the reg get their mind 'changed' to ignore facts, reset memories, alter perceptions, and generally behave as if its a normal school year. Ami might indeed know more than she pretends, but that event didn't reveal anything for it. My suggestion, is look for the girl that remembers things they should not and whose behaviors dont reset. I for one feel the 'maya is a nerd' joke is a clue. Nothing maya does is nerdy, not the maya we have come to know, because she has basically outlived her nerdy teenage behavior we have no clue how old she is mentally at this point at all and she probably started while a true teenager as a massive nerd, so everyone's opinion of maya is based on what she was like before this started, just as everyones high unwarranted regard for sensei stays the same no matter how much he slacks and bangs teenagers, its just reset the moment it goes off script. Find the girl that doesn't think maya is a nerd. If ami is still mad at sensei and brings up the haruka thing later, in an unrelated event, it would be some cool evidence imo for ami having system controls maybe
I am highly sus of Yumi knowing more than she lets on, but having little to no control of this setting. Be a blast if the main reason she never goes to class is cause she knows it doesn't matter, lowers the sus she gets from maya because she is already labeled a delinquent from before this started so it doesn't seem to out of character if she just shows up less and less over time. that's wishful thinking though, no evidence, just an idea that can fit in the narrative. (she is also the only other character that doesn't seem to forget anything that happens, she is just never around enough to make it obvious, those small events and times she is there for standout to me because the other girls minds are generally blanked of sensei's bad behavior or inconsistencies while she still sees it, called him out for fucking his niece while she was pissed, no one else reacts to it really)