It is said that abridged manuscripts were circulating in the late Heian period, and that the oldest of these (from the Hoen era) was supplemented by using text from Ruiju Kokushi (Classified National History).
平安時代後期には抄本が流布していたとされ、最古の写本である保延年間のものは、類聚国史から本文を補っている。