So the stage production is set between after Yoshioka-sensei leaves and the prefectural competition. It directly addresses some parts from the book like Saori adding lines to the play, and adds some character development pertaining to Nakanishi such as possible reasons why she became mute in the past. It also addresses how the actors are able to relate to their roles; Garuru playing Campanella's father while not having a father, whether or not Nakanishi's past trauma causes her to have trouble saying certain lines, and then Saori lacking confidence in directing after Yoshioka-sensei leaves. This last one was kind of touched on in the movie, but it's fleshed out more in the stage production. Most of the drama club girls from the movie were in the stage production, which was good.