The project is two years in the making for the students of Fukuyama Technical High School, situated some 60 miles east of Hiroshima.
Organizers say this year is not just about discussing the threat nuclear weapons pose to the world; it's also about offering a pathway to a possible solution.
The bombing of Hiroshima on August 6 in 1945 killed 140,000 people.
Without naming specific nations, Matsui warned that "certain countries are explicitly expressing self-centered nationalism and modernizing their nuclear arsenals".More news: Trump going ahead with taxes on $16B in Chinese imports
Matsui called nuclear deterrents and umbrellas "inherently unstable and extremely dangerous" approaches that seek to maintain worldwide order by only generating fear in rival countries.
But reports suggest Tokyo is considering a summit soon between Kim and Prime Minister Shinzo Abe, with local media floating a possible meeting on the sidelines of an global forum in Russia's Vladivostok next month. They included representatives from 85 countries, as well as survivors of the bombing. Japan, which hosts U.S. troops on its land and falls under the protections of the US's nuclear umbrella, has not signed the treaty.
The US military dropped a second atomic bomb three days later on the city of Nagasaki, killing about 74,000, and Japan surrendered to Allied Forces on August 15, bringing an end to the war.More news: Confidence back, Sergey Kovalev ready to be tested by Eleider Storm Alvarez
"We in civil society fervently hope that the easing of tensions on the Korean Peninsula will proceed through peaceable dialogue, " he said.
The anniversary comes amid hopes to denuclearise North Korea after its pledge to do so at the Singapore summit in June.
Japan needs to lead the worldwide community toward "dialogue and cooperation for a world without nuclear weapons", the mayor said at the ceremony attended by Prime Minister Shinzo Abe, who later said his country's position not to join the treaty remains unchanged.
For example, the Imperial Japanese Army's notorious Unit 731, which was based in the Pingfang district of Harbin, the largest city then in northeast China, was set up around 1936 and conducted vivisection experiments on live human beings to test germ-releasing bombs and chemical bombs, among other criminal atrocities.More news: Boris Johnson told to apologise over 'totally out of order' burka comments
In order to gain cooperation, Abe said, world leaders must understand "the reality of the tragedy of nuclear attacks", and reiterated Japan's pledge to maintain its pacifist and nonnuclear principles.
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