Extant Mansai's diary is called "Mansai Jugo Nikki" (Also known as "Hosshinin Jugo-ki," Diary of Mansai) which was recorded on the back of the guchureki (Japanese Lunisolar calendar) from 1411 through the year Mansai died, and the copies written by Mansai are existent.
満済が具注暦の裏にその日の出来事を記録しておいたものが『満済准后日記』（『法身院准后記』）と呼ばれ、応永18年（1411年）から死去の年までの記事があり、自筆本も伝存する。