The story is that Fugen Bosatsu preached Fudo Myoo, which he felt, to the living things with Monju Bosatsu at the great Buddhist mass of Dainichinyorai, and that Dainichinyorai gave a favorable blessing.
大日如来の大法会で普賢菩薩が文殊菩薩と衆生に向かって自らの感得した不動明王について教えを説き、大日如来がお墨付きを与えるという筋書き。