Wall not going into the sea makes sense. But it would mean Io could build a raft and get outside of the city whenever she wants.Two very technical explanations:
1) Sensei's actual words are "...come to think of it, you [Ayane] are rarely even around when that happens, are you?". It's not really never if one wants to be a Mr. Literal and if one wants to count Stop Looking For Answers as Ayane actually being around Sensei's past blackouts at least once (though it was by the very end of it and Ayane at the time didn't know what was happening). Still, I would also assume that "rarely even" is enough the same as "never" to avoid playing around words too much.
2) TH15 15NT M3 is v0.38 and Operation: Sleepytime is v0.42, so "technically" by the time of the latter event, Ayane has been made aware of Sensei's strange condition, and can identify it when Sensei was experiencing shit.
Can you elaborate on "morning Ami and night Ami are different in the beach"? am interested.
As for Himawari shapeshifting to Ayane, Himawari has more than once expressed her unwillingness to transform into her mom; my impression from reset5 is that she does have a valid, existential reason for not doing so and it's not just about preference. So even if Himawari someday starts mass disguising as everyone at every turn, Ayane would still be off limits if there isn't a strong enough reason for her.
(Besides, for narrative reasons, I don't think Himawari pretending to be other girls is, has been, or will be an frequent everyday thing. It's a Pandora's box level plot device if its use is less than meticulous. IMO the transition has to be seen by players' point of view or things get overboard very easily when, technically, she can just be everyone.
You can either believe that Kumon-mi looks something like the following, or this is simply a case of "it makes sense if you don't think about it"
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About Ami, this is after Ayane doesn't come out from forest for a whole day. And apparently she is not worried.
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This is Ami, right after she dropped Ayane in the woods.
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And she is worried or (concerned).
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I don't know you guys but i would not worry about my friend who is lost for 30 minutes. I would be worried for a friend who would be lost for 24 hours. With Ami it is total opposite. I'm not sure if it is day/night cycle or effects of the moon or something in the wood. But something changes her character.
She may be acting about being worried and stuff, but why she doesn't continue to act like she cares about Ayane in front of Maya in the morning.
Note: Finally i can share screenshot again. Yay.