In the end of Heian period, kokushi and ganpishi made of kozo replaced mashi (paper made of hemp), which was difficult to and time-consuming to handle, and especially usu-yo of ganpishi became mainstream.
平安末期には、取り扱いが難しく手間のかかる麻紙（まし）が作られなくなり、楮の穀紙や雁皮紙にとって代わられ、雁皮紙も特に薄様が主流となっていた。