It's very nice -- but I'm getting a really unsettling vibe from Ruby. From page 14, her "things [I] wanted to say but never did" bit. "[W]ishing I had said something back then."
Now, that could just be canon stuff about her sister and the breakup of the first incarnation of Aqours -- but it almost feels like, more recently, she had a crush on Yoshiko and missed her chance. Maybe that's reading too much in. I guess it depends on how far back "back then" was.