It's Ono Mizuho-san!
Since she brims with curiosity, and often cries!
My way of thinking is to start by being skeptical of many things, but Ono-san is the opposite, and I feel like the fact she doesn't question things is what makes her pure.
Fukuda Marine
It's Doi Fuka-chan!
Since she's the youngest member in Tsubaki Factory!
Yofuu Runo
Uemura Hasumilk-chan
She's loved milk for the longest time and even now that singlemindedness is cute.
Ishii Mihane
Murata Yuu-chan!!
She's so incredibly pure that she gets startled by thunder and lightning.
Murata Yuu
Yagi Shiori-san!
Since I think she's very true to her own feelings!
Doi Fuka
Murata Yuu-chan
Since when it's thundering she gets startled and looks like she'll start crying.