OK, but the scene is actually a rakugo.
https://en.wikipedia.org/wiki/Rakugo
Earlier spoilers had told us that this was a classroom full of kids. It's not. It's a performance like a one-man play. That man is retelling the story of Orochi's defeat to an audience of adults.
After that, the crowd cheers as the shamisen begin to play. There's an adult player next to Toko who might be Hiyori. But the other panels of her are of the memory of what she said, as told by the rakugo story teller.