She is a mysterious android doll that Hank found along the shores, it is reveled in ep.10 that just like Kaguya she is from another universe and her task is to protect Kaguya from the pirates whom are also from their world.   (ANN)

Over the years, many strange things have washed up on the shores of Windaria. Rick, a former swordsman, knows this all too well, having been found on the beach with a profound case of amnesia himself. Perhaps that's why Rick takes a quick interest in Kaguya, a girl who arrives in Windaria in a similar waterlogged and memory-less condition. It soon becomes apparent that his swordsmanship will be needed to protect her. For dark forces are on the move, all of whom seem to be seeking Kaguya!<br>
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(Source: Sentai Filmworks)

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