In 1599, however, Junson became at odds with his older sister who inherited Kosho-ji Temple after the passing of their father, defecting to the Higashi Hongan-ji Temple side to which his uncle Kyonyo belonged.
だが1599年、父の死後に興正寺を継承すると姉と不仲となり、伯父の教如がいる東本願寺側に離反する。