Yuzuki is a persocom created by Minoru Kokubunji roughly two years before the start of the series. Yuzuki was created to resemble, physically and mentally, Minoru's late sister, Kaede, who had died from an illness two years earlier. Yuzuki is programmed with all of the data that Minoru could remember about his sister; what she liked, what she disliked, as well as her habits and behaviors. However, Minoru still realizes that no matter how realistic she may be, she is still only a persocom that is following her programming.
Source from Wikipeida
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