Nichiu established Nichiren Shoshu kyogaku (study of Buddhism sect) and Nichiren Honbutsu ron (theory that Nichiren was the original Buddha), and is respected as the restorer of the Nichiren Shoshu sect together with the 26th high priest Nichikan.
26世日寛とともに中興の祖として仰がれ現在の日蓮正宗教学及び日蓮本佛論を作成した人物である。