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I read it a long time ago on Fanfiction.net. It was about usagi being mistreated by the girls and mamoru. She moves to the United States to live with her uncle and brother. Where they train to become stronger. The uncle and brother were both from the moon kingdom. The brother had the name sun somewhere in his soilder name.
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I think that's one of Princess Destiny's fics. Don't ask me to remember which one, though.