主人公の実姉で幼い頃から天才として研究やスポーツの分野で数々の功績を残す。 舞台となる学園では伝説の人として語り継がれている。 現在は海外の研究機関で働いている（らしい） 謎の多い人物。 「すべての道は姉に通ずる、って言うでしょ？」
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