Cute, yes – though I’m especially intrigued by the two words Noeru spoke and what they suggest about her character. (I know next to nothing about Yuuki Aoi, though; my only previous encounter with her voice was in Kure-nai.)
Completely agreed on Kobayashi Yuu; she’s a solid choice for Kazumiya Rio. It’ll probably take another episode for me to get used to her as Rio, though – in my head that voice still rings a little too strongly of Nagi-senpai.
True, that. I imagine that having less speech-time to work with makes the writer/s very careful about what to put into the mouths of our silent sentinels. Nary a word wasted, every syllable loaded with meaning.