According to those researches, the 25 volumes, that is, the rest of the total 30 volumes from which Jindaiki (Records of the period of the gods) in the first and second volume and the authentic records of the section of Emperor Tenmu and Empress Jito in the 28th, 29th and 30th volumes are excluded, are roughly classified into the two categories.
その結果によると、全三十巻のうち巻一・二の神代紀と巻二十八・二十九・三十の天武天皇・持統天皇紀の実録的な部分を除いた後の二十五巻は、大別して二つに分けられるといわれている。