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[[WMG: What did Yui promise in exchange for [[spoiler:becoming human again?]]]]
Since the ending specifically mentions that she [[spoiler:parted ways with Kinta]], maybe the very bond that proved her humanity was the price she paid to keep it.
Since the ending specifically mentions that she [[spoiler:parted ways with Kinta]], maybe the very bond that proved her humanity was the price she paid to keep it.