Rimi is Asleep

I love how she shouts "Rimi!" when she wakes up.

Is it her shouting? I thought it was Ryuto shouting along with the clap.

I also thought it was Ryuto shouting because that would make more sense, but it's possible that it's Rimi.

Well, I thought of the possibility that it was Ryuto, but a few things came to mind:

The speech bubble is closer to Rimi than it is Ryuto, and he usually calls her by her nickname "Atlantae". I don't think he's ever called her Rimi before.