She’s unaware because she’s a little kid who had a growth spurt and hasn’t gotten used to having a more adult body. She’s probably still used to running around climbing trees in shorts.
You’ve obviously never been here and seen how many Starbucks/Costa/Caffe Nero/Pret/Black Sheep are on every street and station, with many more frothy coffee outlets in petrol stations, supermarket, etc.
First Coolkyou the giant perv famed for drawing huge boobmonsters and shota does a chapter with MC nipples without it being lewd, and now this.
Well cooked, Norio-sensei.