It is said that what Dosai MATSUNAGA and Inoue Kazue no kami (Masanari INOUE), sent to Ieyasu at Sunpu by Hidetada TOKUGAWA, the second shogun, in the early Genna era (1615 - 1624), heard from Ieyasu during their several-days' stay there, were recorded in it.
これは松永道斎が、井上主計頭（井上正就）が元和(日本)の初め、二代将軍徳川秀忠の使いで駿府の家康のもとに数日間の滞在した際に家康から聞いた話を収録したものという。