Kohaku (コハク) is a young woman who a descendant of modern humans. She is Ruri's younger sister and the daughter of Kokuyo. She is one of the protagonists of the series.
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Kohaku (Dr. Stone)
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Kohaku (コハク) is a young woman who a descendant of modern humans. She is Ruri's younger sister and the daughter of Kokuyo. She is one of the protagonists of the series.