When is the canary's birthday in Rose Girl? What is the constellation?

It's a pity that canary's birthday was not introduced in Rose Girl. What I found on the internet is all the guesses of netizens, because the official has not announced it yet. Maybe the canary found by the landlord in Virgo is not among the rose girls. In the netizen's guess, the canary's birthday is July 5, Cancer. It is also said that Rose Girl's birthday is very special, and there is other meaning, which is a special speculation. Typing for a long time, I hope the landlord will adopt it! thank you