fun fact: the only two non-vocalist 3*s in which the instrument of the girl in it is neither shown nor alluded to (with boomboxes or glowy things or music notes or anything like that) are Serene New Movement Eve and New Year's Michelle. (Santarisa has music notes on her bag so she's out)

one could argue that the Eve does actually have a nod to her instrument, that being the organ in the back ... organs aren't pianos or keyboards but they're kind of similar, so that may have been on purpose. there's nothing at all like that on the Michelle. so depending on how you see it, Michelle might be the only one. the Rinko in the same gacha as Eve does have a piano though, so ...

why would you wanna know that? ... uh, I don't know. but now you do. yay!