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The rrat is that Pekora is secretly a member of an Uyoku Dantai group and that she told Kiara WAITO PIGGU GO HOMU! Hence Kiara was forced to go back to Australia.
But the real reason was Pekora trying to show Kiara holojp minecraft server and planned it meticulously, only for Kiara to start a war and fawn all over Pekora, uninterested on Pekora's tour, wasting her time planning.
But in all honesty though, it was Kiara being a fucking egotistical bitch and not even Pekora would want to be associated with her.