I really like how the in-show script parallels what's going with Kana and Aqua. Kana has dreams and a passion for acting, yet she knows that the show will never amount to anything, which is very similar to what Aqua says on page 16: "Nobody wants someone like you. Know your place, and stop dreaming already. You'll never amount to anything. Your life is nothing but pitch darkness."
And yet, even so, she still has hope, both in-show as a the protagonist girl, and in-universe as an actor.
It's explicitly stated that her last expression on page 21 isn't an act, but I don't think her full page expression on page 18 (which works both as a climax of this chapter and the drama) is an act either, thanks to Aqua's actions.
Or, to quote page 5: "The young girl who doesn't know love, sheds tears, having been protected by someone for the first time."
10/10 chapter, this is the Akasaka Aka that I know.