[10] The original book had been present together with a copied manuscript of Oku no Hosomichi called Sora Hon in the same box made of paulownia wood.

For instance, Yawatei Ukō wrote the summary of the Diary from April 21 at Shirakawa to May 9 at Matsushima in Aokage Shū.

[6] In Meiji years, the book was possessed by Kuwahara Shinzō of Osaka, which went to Saitō Ikuta of Itō, who had been a famous collector of classical fine arts.

Yamamoto Yasusaburō heard of it and with the introduction of Satō Seiiji, he witnessed the airing of summer in 1938.

Shōichirō Sugiura visited Hirosuke Saitō, the owner living at Uemeguro, with Saburō Miyamoto and examined the Diary on November 5, 1950.

[19] Sugiura's original idea was to obtain the Diary in Wataya Bunko of Tenri Library, however, it was not realized.

[6] Prior to the rediscovery of Sora's diary, studies on Oku no Hosomichi were based on indirect findings.

[22] After the re-discovery, Sora's diary has become indispensable, for instance, one should read the Haikai Kakidome for the beginning Hokku.

[11] Yamamoto wrote in the beginning of his book that "If this diary still exists today in a complete state, it is a miracle beyond my comprehension.

For the approximately 250 years from the trip to the narrow road of Oku until today, in spite of there being enough distinguished writings on Basho to make an ox sweat to carry them or to fill a library to the rafters, this [diary] still represents a historical document the likes of which has never seen the light of day.

"[18] Shida Gishu was asked to write a preface of Yamamoto's book and wrote that this diary would contribute greatly to the study of Oku no Hosomichi, and every study would contribute to the proof of this diary and attested to the real writings of Sora with various examples of proof.

[23] Prior to the discovery of the diary, Shida had pointed out that not all recorded in the Oku no Hosomichi was necessarily true and that there were examples of fabrications.

Atsuko Kanamori (ja:金森敦子), a Japanese historian, tried to explore the Sora's diary by studying the references and travelling on the route herself.

Sora was appointed to be Basho's travelling companion, and studied the places of previously composed famous Japanese tankas.