Lol you brought it here, huh Craig? I suppose it belongs
I tell you, reading through and translating all those blog entries sure convinces me Chisa has quite a thing for Miya. Thing is, Miya plays it all cool and never says anything in return. Miya actually has multiple girls going after her, namely Chisa and Saki, but there've been the hints over time of like Chinami and Risako too.
Again though, Miya without fail just plays it cool and never responds with what she might think of it herself
So in this case, if there is something, it's kataomoi one-sided love
If I had to choose, I'd still choose MiyaSaki as the true pairing since they actually do hang out together and reciprocate quite a bit (if not Miyabi actually saying anything while Saki gushes over her lol).
Something else happening lately is that Saki has been hanging out with Mai and Chisa quite a bit (I think since they're working together on the Sengoku Shishu play), and there's rumor Chisa's letting her hang out with them only to get closer to Miya
Did you see the entries from the Buono! concert last week and the Berryz release event over the weekend? You can read them in her b!p category, but the pictures generally tell the tale
Chisa with lots of purple glowsticks (Miya's color), and also wearing Miya's release event shirt
Although Chisa often gushes about Miya on her blog.
The other girls have even started mentioning it more too, such as around the middle of this clip of C-ute from Kawaii Girl Japan...: