In this paper, I discuss the Rite of the Mystic King Daigensui (Daigen [sui]-hō), which is considered one of the great rites of this world. However, because I have not been initiated into the rite in question, there are some limitations to my discussion. I provide a brief overview of the monks Jōgyō and the bettō of Hōrin-ji temple, who imported the rite to Japan, using the Daigen hiki [The Secret Records of Daigen], which I have previously reprinted and reported upon, as well as other historical materials that have been rendered into print to date.