[1][2] He is also the Supreme Advisor of Sōka University and the Acting President of Soka Gakkai International (SGI).
In 1953, he became an adherent of Soka Gakkai (at the time was one of the several lay organizations of Nichiren Shoshu Buddhism).
According to Soka Gakkai, he was a left-wing protester and a student activist, participating in the demonstration into the National Diet Building in the 1960s.
In a 1976 interview, Harada provided views of Soka Gakkai which contrasted with traditional Nichiren ones; although the latter has typically seen natural disasters as arising when society refuses to adopt the "True Law", Soka Gakkai viewed such effects as being subtler, as in societal problems rather than the likes of earthquakes.
[2] On 8 November 2014, Harada officially declared in the Seikyo Shimbun newspaper that the original tenets of the Soka Gakkai Constitution from 1930 have been revised and the Dai Gohonzon image that was once venerated within the organization is no longer its object of worship, further disassociating Soka Gakkai from the Nichiren Shoshu Buddhist sect.