https://imginn.com/p/DItNcetS4kZ/
Non posted few minutes ago an Instalive, where she's talking about the Singaporean GP tour with a HIS staff member and you can hear the voice of that girl sometimes (I watched it skipping here and there)
Given that, I think she streamed from HIS headquarter

 >>/264/
It was my opinion that she'll debut after the Golden Week, I should've been more clear.... Anyway, thank you very much