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I'm actually a bit surprised that 'ore' and 'boku' are being used, but 'watashi' isn't. Watashi is a more neutral pronoun, but ore and boku are specifically used by men. If the caller is a women disguising her voice as a man it may be a trick to mess up Natsuhi as well, since only females who want to sound rough or more masculine use male pronouns and they generally use 'ore' in that case.
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