主人公とは子供の頃からの付き合いで家族ぐるみで交流があった。 年齢は一つ上で昔から主人公に対して姉のように接してきたもう一人の「お姉ちゃん」 主人公を溺愛しており、周囲が見えなくなることもしばしば。 「つばさちゃんのお姉ちゃんはわたしがなるんだから！」
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