HQ!! voice actors chatting on the Bluray/DVD Vol.9 Special CD.
The 3rd years talk about Uchiyama (Tsukki) and Saitou (Yamaguchi).
Irino (Suga): The Uchiyama-Saitou pair, you know… they stand out.
Hino (Daichi): They do.
Irino: Their relationship is similar [to the series]. Uchiyama is just too Uchiyama, too Tsukishima.
Hino: Ucchi is free, right?
Irino: Yeah. Really free.
Hino: Doing things at his own pace.
Irino: No matter what people tell him, he’ll simply say “I’ll do things the way I want to do them”.
Hino: Indeed. Remember when we practiced volleyball? Ucchi would sit alone in the back as soon as he got a little tired. Like, “you guys, carry on.”
Irino: And Souma-kun is really quiet, right? He’s exactly like Yamaguchi. I have to call out to him— but he seems nervous even if I do, making me wonder if I did something scary.