I'm doubtful about the lolicon tag. Is it because Ayano is attracted to other teens?
I was under the impression that "lolis" where somehow (real or fake) pre-teens.
Taking a look at the first couple of pages, she's in eighth grade. So that puts her at about 12 or 13 years old, at most.
The novel Lolita, where the term comes from, concerns attraction to a 12 year old, so it's pretty consistent.