The diary is regarded a valuable historical source, as a supplement to those years which have been lost from the ''[[Ryuei hinamiki]]'', one of the most extensive official shogunate records. The portion from 1631 to [[1673]] contains 79 volumes. | The diary is regarded a valuable historical source, as a supplement to those years which have been lost from the ''[[Ryuei hinamiki]]'', one of the most extensive official shogunate records. The portion from 1631 to [[1673]] contains 79 volumes. |