In 816, Emperor Saga accepted Kūkai's request to establish a mountain retreat at Mount Kōya as a retreat from worldly affairs.
For the historical Haida chief in the Queen Charlotte Islands of British Columbia, see Koyah.
In the end of 1970, according to former high school principal Hiraoka Shizuto, Onoue became a monk at Mount Kōya's Kongōbuji Hōon'in temple and adapted the name of Junkō.
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He exhibited outstanding talent in calligraphy, and his uncle, who was a priest of the Kōyasan Shingon-shū on Mount Kōya, encouraged his interest in the writing style of Kūkai.