As Tomomitsu had been passionately committed to the Buddhist invocation from his early days, he first became a believer of Honen (a priest; founder of the Jodo sect [the Pure Land sect]), then deeply embraced Shinran (a priest; founder of the Jodo Shinshu sect [the True Pure Land sect of Buddhism]), who happened to be at Shimotsuma in Hitachi Province － Shimotsuma was one of his lands － he finally became a priest, in his last day, as he had long cherished to be, calling himself as Yuki Kozuke Nyudo (priest) Nichia and built Yuki Shomyo-ji Temple.
若き日から念仏に傾倒していた朝光は、法然、次いで時領常陸国下妻に滞在していた親鸞に深く帰依し、その晩年は念願の出家を果たし、結城上野入道日阿と号し、結城称名寺を建立。