Hoshino Aqua confirmed for the role of the murderer

Easiest prediction, kinda? Since the plot has to be condensed into a movie, I guess they would combine the mastermind and stabber into one role, so this prediction can still be 100% right.

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The competition for Ai’s role is really down to just Ruby and Akane now. I would have went all in on Ruby, if not for the fact that Akane is going last - and we know to always save the best for the last - in their private audition.

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Aqua monologueing like a villain

They have made it obvious from the outset that Ruby takes heavily after their mother. The less obvious one (or maybe it’s obvious to y’all?) is Aqua, who is slowly revealed to be taking after their father.

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With only two episodes left, there’s no way they can fully cover this arc. One meta detail is that this season is 11 episodes long, not 12. I bet they would announce a continuation once this season ends like with previous seasons. This would be so meta, but I won’t be surprised if the continuation takes the form of a movie.