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Tanaka's journey as an advocate against nuclear weapons is deeply personal. Having been just 13 years old when the atomic bomb was dropped on Nagasaki, he faced the harrowing loss of five family members that day. These tragic experiences propelled him into activism among other hibakusha—survivors of the bomb. After completing his education, he dedicated two decades serving as Secretary General of ni on hido, which involved extensive travel across Japan and internationally to raise awareness about the horrors of nuclear warfare.