I think Namori's given us more flags for it being Miho than the others. The one I think is most notable (for any of the girls) was way back when Miho bought the hairband Nadeshiko liked in addition to the one she liked, then secretly showed it to her. There wasn't any reason to do that other than having a relationship to keep secret. Things like the phone call this chapter just add to it.
Of course I think Miho's the cutest and I'm rooting for her, so I'm not unbiased.
I agree, Miho is a good pairing but a part of me can’t help but to feel that Nadeshiko could actually be three timing or having multiple “it’s complicated” relationships based on their interactions. Nothing bad, just bittersweet. So, if someone else has an argument for other pairs, I’ll accept that too.
In my mind, it’s like extrapolating how Kyouko’s relationship with Yui and Ayano in highschool/future could evolve into. Though Kyouko being herself, it might as well be all fun and sweet, probably.
Anyway, that’s probably more of me imagining the talks and stuff they have over the phone calls behind the scenes….
Really, not many series can leave things vague like this and still be satisfying.