The work covers the 95-year period from the beginning of Emperor Mommu 's reign in 697 until the 10th year of Emperor Kammu 's reign in 791 spanning nine imperial reigns .
The work covers the 95-year period from the beginning of Emperor Mommu 's reign in 697 until the 10th year of Emperor Kammu 's reign in 791 . The text is an account of nine imperial reigns .