Thread:Norleon/@comment-30764484-20131128043453/@comment-3261234-20131128120428

Phew, nice research, seriously! Even though it is a bit speculative, I think we can go with the first option. The last is, as far as I know, really out of the question since the birthdays can be found nowhere, not even in Japanese websites (I searched high and low).

But again, I can agree to the first option. Sumire and Nao have to be 15 or 16 when it's their first year, Jun has to be Ui's and Azusa's age (roughly) and the Onnagumi girls are kinda in the HTT league.