When Tokuhei YAMAGISHI discovered "Towazugatari" in the Imperial Household Archive (at that time known as the Bureau of Drawings and Books), he felt intuitively that it was equal to even "Kagero Nikki" (The Gossamer Years).
書陵部（当時は図書寮）で『とはずがたり』を見出した山岸徳平は『蜻蛉日記』にも対等すると直感したという。