A noted anti-Christian and staunch opponent of Christian missionaries in Japan, he applauded Japan's triumph in the Russo-Japanese War in 1905, stating that "The war with Russia is divinely inspired to make Japanese citizens aware of their heavenly task." In 1908, he moved his base to Miho, Shizuoka Prefecture, where he would write his most famous work, "The Doctrine of Saint Nichiren" () in 1911, in which he casts the radical 13th century priest Nichiren as the champion of the Japanese nation, and called for world unification through Nichirenism with the emperor as its core. "Japan's very purpose of existence," he writes, "is the implementation of this plan, as a country conceived for building Nichiren Buddhism."