Ō no Yasumaro's preface, in the form of a dedicatory address to Empress Genmei, begins with a poem summarizing the main contents of the work. He then relates how Emperor Tenmu commissioned Hieda no Are to memorize the genealogies and records of the imperial house years earlier, and how Genmei in turn ordered Yasumaro to compile a written record of what Are had learned. He finally concludes the preface with a brief explanation of the Chinese characters used to transcribe native Japanese words in the text and the division of the work into three volumes.
