Nichiga was opposed to the Happon policy by Nichiryu of Honmon school of Hokkeshu sect, and developed the Montei-juryo theory embraced by Nichiyo, in his effort to reinforce the development of Fujimon school, after which he came to share the title 'Toga Saishin' (Nichiga of East and Nisshin of West) along with Nisshin of Kyoto Yobo-ji Temple.
日隆(法華宗本門流)の八品主義に反対して、日要の奉じた文底寿量説を発展させて富士門流の発展に尽力して京都要法寺の日辰とともに「東我西辰」と並称された。