Each section has a brief explanation, and includes citations from references from days of the Rikkokushi (six ancient literatures, up to the 9th century) to the Keio period (just before the Meiji period, almost the middle of the 19th century).
それぞれの項目に簡単な説明を付け、六国史以降、慶応期までの文献から参考になる箇所を引用している。