He served as member of the Upper House of the Diet in the early years after the Second World War, and in that capacity helped in 1949 to pass the law proclaiming Hiroshima a city of peace.
[2] It was under his administration that Japanese Prime Minister Eisaku Satō participated in the memorial ceremony on August 6, 1971, the first time such ceremony was attended by a Japanese Prime Minister.
[4] He continued to approach the US government on matters of nuclear disarmament, and on June 19, 1974, addressed a cable to US President Richard Nixon as follows: "On the occasion of the summit meeting with Soviet leader Brezhnev in Moscow late this month, I have learnt you two world leaders would deliberate Nuclear Test Ban Treaty.
Also, I sincerely solicit your Excellency to take resolute measures in avoiding current touch-and-go crisis of human holocaust.
[6][7] As a result, for the first time in human history, a World Constituent Assembly convened to draft and adopt the Constitution for the Federation of Earth.