[Yuri just happens to be sitting nearby (he's got several books from the department store open in front of him like he was trying to study, but it doesn't look like he's made much progress) and he raises a hand as Aya walks by to catch her attention.]

Hey. Couldn't help but overhear your conversation with your partner. [He tips his head a bit to indicate the Audino.] You really think you'll be able to get her to sing?

[...Is Ichigo a girl? Well, that's what Yuri's assuming.]