Flip Flappers
I'm probably just dense but, does anyone know why Cocona looked shocked as hell and started crying, when Papika said that Mimi was a close friend? Why did she look so heartbroken? I feel like it was a scene about someone confessing to their lover that they've been seeing someone else
Just think about it. Cocona always looked pretty lonely. She had ONE close friend in Yayaka.
She was already feeling weird everytime Papika called herself Mimi. Why? Papika was her second close friend, and there was the possibility that she has romantic feelings for her. Why someone she cared about was calling her by another name? (to be fair, I think it makes a lot more sense if we consider romantic feelings too, but even as a friend it would feel weird).
Then came the Yayaka reveal. Her only close friend only approached her with ulterior motives. Sure, Yayaka might have become friend with her with time, but how will she believe that now? She's already lonely, and probably doesn't trust people that much.
So the next time she saw Papika, she wants answers already about all the "Mimi" thing. It's the first thing she asks, after Yayaka reveal. After all, there's two things she knows: All those travel to PI have something to do with Mimi (remember that the amourphos were called Mimi's fragments by Papika) and that Papika saw Cocona as Mimi sometimes. So it makes sense that her reaction is that she was just a replacement for Mimi. And maybe being used to bring her back, then Papika would abandon her. Maybe Papika loves her, but Mimi is the one she loves THE MOST. It might looks silly, but to a introverted person like Cocona, that's a big deal.
The final blow was her grandma, the ONE person she thought she could trust being a traitor already. The one person she had through all her life. So yeah, the entire point of this episode was to break Cocona.