At age 10, Junson entered the Buddhist priesthood under Junnyo, the 12th chief priest of Hongan-ji Temple (and the founder of Nishi Hongan-ji Temple) who was also Junson's uncle and the husband of his older sister.
10歳の時に叔父で姉の夫でもある本願寺第十二世門主・准如（西本願寺の祖）の元で得度する。