The writings of the Foundress Nao, known as the Ofudesaki "From the Tip of the Brush" were essentially automatic writing. Onisaburo's mystical experiences outlined in his 81-volumes Reikai Monogatari "Tales from the Spirit World" (the essential principles of which were later condensed into a book called Foundations of the Spirit also have much in common with spiritualism. Thus from an early time, Oomoto has cultivated relations with spiritualist groups around the world.

The first contacts were made in 1926 when Aizenkai emissaries to Europe met with the Weisse Fahne (White Flag) spiritualist organization of Germany and the White Fraternity of Bulgaria. These were followed by links with the Greater World Spiritualist League of England and Liga Espírita of Brazil.

There is a large and flourishing spiritualist movement in Brazil, and Oomoto mantains contact through its old friend Benedicto Silva. Mr. Silva has been an Esperantist since 1946, and is translator for the Brazilian Spiritualist Federation and for the Institute for the Propagation of Spiritualism.