@melReinH and probably @ to anyone who thought this too.
"While I 100% can see why you feel that way. Personally, I feel like she isn't really the "first girl" precisely because of the limited encounters. She was first girl in name, not model. I personally call First girl Miku precisely because she was the first girl to accept MC, as well as have the most romantic encounters."
I just wanted to make an insight on a couple points on line of observation.
"I personally call First girl Miku..."
I can agree, among the sisters, Miku was the first encounter as a romance-able heroine among the quints. She was the first that really interacted with Fuutaro, evident in that when one thinks back, she had the first proper arc.
However, I'd like to point out that she was not the first girl to accept MC, as Yotsuba was there all along from the start. There is no denying she didn't immediately glomp Fuutarou, but she never rejected him being a tutor at all. She never had a phase to "accept the MC" because she was already on his side.
I won't deny, Miku holds the trophy for most romantic encounters, and she was the only other sister I would have been fine with ending up with Fuutaro. I just don't like people denying that Yotsuba was the real "first" to open up to Fuutaro. But, as Negi desired, no girl was a "first girl" in the traditional romcom sense aside from Itsuki, who was put in such a position due to editor meddling.