As Saicho worried that Japanese Esoteric Buddhism was imperfect, he received Kanjo (a ceremony to be the successor) of Esoteric Buddhism from Jungyo and returned to Japan with the intention of systemizing Buddhism as a whole, including Esoteric Buddhism.
最澄はまだ日本では密教が不備であることを憂い、密教を含めた仏教のすべてを体系化しようと考え、順暁（じゅんぎょう）から密教の灌頂を受け持ち帰った。