The KOTOKUI family formed a lord-and-vassal relationship with the Kofuku-ji Temple, and backed by the temple's influence, controlled all things concerning the Onmyodo-Rekido of Nanto including Nichiji Kanjin (a way of divining something according to the time and day) to the shrines and temples as well as supervision of the Onmyoji (a master of Yin yang) and the Shomonji (a group of itinerant performers whose work encompassed both non-performance activites and religious rituals).
以後、幸徳井家は興福寺と事実上の主従関係を結び、その力を背景に南都社寺への日時勘申を初め、陰陽師・声聞師の監督など南都に関する陰陽道・暦道に関する全てを取り仕切った。