This religion became strongly connected to Esoteric Buddhism that was brought to Japan in the early Heian Period, and in the era from the latter half of the Kamakura Period to the Period of the Northern and Southern Courts (in Japan), its unique position was established.
平安初期に伝来した密教との結びつきが強く、鎌倉時代後期から南北朝時代(日本)には独自の立場を確立した。