Alright, I'm supposing here that that girl is not Nino but another quint.>>174009143>Uesugi fuutarou Kun,>You look depressed again>Long time no see
Her saying 'long time no see', and her gettup and hair that look very much like that of the Kyoto girl are like that because she's presenting herself as the Kyoto girl to Fuutarou.
Calling him 'Uesagi Fuutarou Kun' and saying 'you look depressed again' are deliberate references on her part, to remind him of his meeting with the girl in Kyoto. Since only the real Kyoto quint can know these details, this girl is the real Kyoto quint, not a girl pretending to be the Kyoto quint.
Well, that's what I thought anyway, but a problem arises.
Whichever quint that is (outside of Nino), she's acting as the Kyoto girl, but doesn't intend to reveal to Fuu that she, a quint, is the Kyoto girl. She'll just act out the role of the Kyoto girl without admitting that she's a Nakano, in order to motivate him for something, then she'll leave fuck off again. See, if she wanted to prove that she's the Kyoto girl, all she had to do is bring a picture of all five of them together, which Fuu would then recognize, and tell him about the meeting they had. It's fairly easy to prove. But she went this route.
I got two thoughts on this matter.
1. She doesn't want to reveal she's a Nakano because she believes her words would not be taken seriously then. The Kyoto girl's words carry much more weight than a Nakano girl's. She's not wrong there. Also, this would mean she knows fully well they had a fateful encounter years ago that changed Fuu a lot, but doesn't intend to fess up.
2. It actually isn't the real Kyoto quint. It's another quint, but she heard the story from the real Kyoto quint. Not recently, but back when it happened. However, if this story was important enough for even an unrelated sister to remember, I doubt the real quint wouldn't recall it, and the other one would. Very unlikely.