I thought that might be the case.

[ He won't explain his tone of familiarity. However he will lead them into the first few steps. It makes sense: while they only had so much time to become acquainted during the Irodori Festive the general impression he'd gotten from the younger Kamisato was of her being well-cultured. ]

You've remained safe during these unexpectedly treacherous days of the festival, I trust? I must admit... It's made quite the first impression.