"Uetsufumi" is one of the writings called Koshi Koden (ancient history and legends) which contains ancient Japanese history including Ugayafukiaezu dynasty, which was before Yamato Dynasty, written in ancient Japanese characters, but it is said to be gisho (apocryphal book).
『上記』（うえつふみ）は、いわゆる古史古伝と呼ばれる文書の一つで、大和朝廷以前のウガヤフキアエズ王朝を含む古代日本の歴史などが神代文字で書かれている偽書とされる。