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Episode 6:
Let's be honest, based on pieces of the play, I'd say all girls are bad actors, not just Kokona. Kokona's inability to realize that no one was looking at her all showed, that she was not serious. Yes, when playing on stage you kind off cut off the feeling of eyes on you, but at the se time you also become more aware of it. Dunno how to explain this, just basing on personal experience.
Also the ending of the episode was weak. There was no feeling of risk, so no catharsis or even a breath of relief when Shizuka returned.