Also I'm confused why there's a loli tag. The main characters are in high school. One is just super short. Unless you're talking about the pink haired girl and I thought she was an adult or also in high school.
The problem with the loli tag is that it's weirdly defined. On the one hand, there's lolis based on just looks. Aka girls that look childish, regardless of age. It's why there are terms like 'loli-baba' or granny loli, the x centuries old loli trope. On the other hand, some define lolis based on age too. Aka, as long as a girl is under 18 (in most cases, can vary), then she'd be classified as a loli, regardless of figure. It's why the term 'oppai-loli', aka big boobed loli, exists.
If you go by the most strict definition, considering that neither Nako nor Azusa are in their last year of high school
(Azusa's brother is explicitly mentioned to be older than the both of them and he's a year ahead of them), and what's said about a certain pinkie.... You do the math.
That said, I don't think I'll ever understand all this hassle about the age of the pixels on a screen...
