As the age of feminine culture of the nobility during the Heian period changed to the age of the masculine society of the samurai class in the medieval times, more atsu-yo of ganpishi came to be used, called torinoko paper as opposed to usu-yo.
平安の女性的貴族文化の時代から、中世の男性的武士社会にはいって、厚用の雁皮紙（がんぴし）が多くなり、薄様に対してこれを鳥の子紙と呼んだ。