I guess just different parts of the plot(?) It's an actor au so it's like they're on set for the actual story Shirousagi
Oh I see! Now I understand why some people here want the au to be canon, it's nice to imagine they're just acting.
Reminds me of the au of "For my weirdo" where they were also on a film set, the story was quite dark so it's nice to imagine that it wasn't "real" and they're happy in rl.
I'll definitely recommend you to read the main story (of course you don't have to if you feel uncomfortable reading it) so you could appreciate the side story and it's main point more. Shit got me teary in one eyes while smiling.
Does the side story make sense without the main story? I love the art but don't really like the plot seeing chapter 1.