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margo theory is that arisa was soaked with water to make it easier to execute which could make ema or nanoka teh culprit and ema said no ririmu new theory is that the electric chair could been self-activated for a suicide arisa-chan may have committed suicide but maybe not there's a lot of evidence its a bit forced so ririmu's deduction is that arisa was not soaked but rather frozen and then unfreezed there's also a refrigeration room so that's what leads to her theory