sensei = teacher
"Punished Pinion" - pun on the fighting game series Guilty Gear
Junko is playing as Jam Kuradoberi from Guilty Gear.
Why are her hands in such a strange pose?

Dom speaks:
Kuradoberi Jam is, in fact, weird like that. You should just watch her idle animation to see her limbs flying around everywhere...

You can see her shoes, and they are different from her shoes in strip [765].

Piro speaks:
good catch, and that was totally my fault - i left my bookbag at home, and all my reference comics, so i was working from memory for this comic. Completely forgot that i had already shown her shoes.