"Kojiki" (The Records of Ancient Matters) describes that Hiruko was the first god who was born between Izanagi (The Male Who Invites) and Izanami (The Female Who Invites) in kuni-umi (the birth of (the land) of Japan).
『古事記』において国産みの際、イザナギ（伊耶那岐命）とイザナミ（伊耶那美命）との間に生まれた最初の神。