As the above shows, in "Kojiki," "Nihon Shoki" and "Manyoshu" the "ミ" ("mi") of ツクヨミ (Tsukuyomi)" follows the official kana orthography of this era, but "ヨ" ("yo") of ツクヨミ (Tsukuyomi)" comes with "甲" and "乙"-indicating that "ヨ" ("yo") was pronounced in two ways, and even that the sound was replaced with "ユ" ("yu").
以上のように、記紀万葉においてツクヨミの「ミ」はいずれもか行上代特殊仮名遣で一致しているが、ヨの甲乙は両方にまたがり、「ユ」の例すらある。