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It was obvious to me from the very start, that Shizuka was in Kokona's imagination. The way she did not interact with things, the she did not seem to talk to anyone but Kokona, the way she was positioned most of the time.
The audition was bullshit though. Changing the scene for 1 person because of a whim means that this person gets special treatment and is not assessed on equal terms with the other candidates. At the least, I would have given previous participants a choice to try the new scene right there and then, if they were willing.
Will give this a chance. Maybe it will work similar to Gakkougurashi!, but considering how obvious the twist was for me from the 2nd, if not 1st appearance of Shizuka, I fear they may get tired of this gimmick pretty quickly.