I wonder how dying feels like in this game, especially when you get your neck cut like that. It's gotta be a very uncomfortable experience at the minimum. Traumatizing at the worst
Heres the context for that: What the teacher was saying wasn't about a Math problem. It was just his way of calling a random student. Kurose's class number was 12, so he ended up being called. Why subtract by 5 specifically? No reason.
I think Haimiya would die actually. With how much she blushed from him calling her just by her first name, I think she'd die on the spot if he complimented her.
That outfit is kind of basic. It's almost just the same as the white shirt and shoulder bag male leads always seem to wear in romcoms for some strange reason
That's basically the plot of "The girl I like forgot her glasses". I don't think the girl was a senpai though. Just a classmate.
That TL note might just be referencing that manga actually. On second look, yeah it definitely was meant to be a reference.