While "Ciro" is a few years too young to be any sort of rival, he's a fellow library lurker when not attending gardening club. In the last year(ish), he's been learning how to cook and bake better- especially the latter, because it's easier to gift people pastries than a whole meal. So it's possible that she's seen him looking up books in the library besides his usual studying/schoolwork... Or definitely seen him around with his siblings who also attend the school.

(One of them, Makoto, is definitely in the game- their "little sister" wasn't able to get in this app round.)

So there's all that, if you're interested!