The Hiroshima Atomic Bomb dome (front left) and Peace Memorial Park (centre), as people attend the 73rd anniversary memorial service for the atomic bomb victims in Hiroshima on Monday, with the city's mayor warning that rising nationalism worldwide threatens peace.
Matsui also expressed hope for the easing of tensions on the Korean Peninsula to proceed through "peaceable dialogue", as the US and North Korea reached an agreement to denuclearize the peninsula in their summit in June.
The attack on Hiroshima, 700 kilometres west of Tokyo, in the closing days of World War II ushered in the nuclear age.
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"Even without language, once you see the images, you understand", said Mei Okada, one of the students working on the project at a technical high school in Fukuyama, a city about 100 kilometers (60 miles) east of Hiroshima.
Despite such a tragedy, the ambassador said, he believes that people in Hiroshima do not have negative feeling toward the people of the country, which dropped the atomic bomb.
Meanwhile, Prime Minister Abe said in his speech, "It is the duty of Japan, as the only country to have been hit with atomic bombs in wartime, to work tirelessly in pursuit of a world without nuclear weapons".
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Klea Bertakis, a physician and researcher at the University of California, Davis, who studies gender dynamics in health care. They found that 13.3% of female patients seen by a male physician died, compared with 12% of women treated by another woman.
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Joining Cincinnati Edition to discuss efforts to prevent future use of nuclear weapons are Director of the Peace Resource Center at Wilmington College, Dr. Tanya Maus; and Wilmington College Adjunct Professor of Public History and Cincinnati Art Museum Digital Specialist Rachel Ellison.
The role Japan can play as the only country to have suffered atomic bombing has come into sharper focus with the world still far from being nuclear-free.
Among five major nuclear weapons states, representatives from the United States, France, Russia and Britain took part in the event.
A woman burns a stick of incense at the cenotaph dedicated to the victims of atomic bombing at Hiroshima Peace Memorial Park in Hiroshima.
Matsui's call however highlighted Japan's contradictory relationship with nuclear weapons although Japanese officials routinely argue that they oppose atomic weapons.
The bombs claimed the lives of 140,000 people in Hiroshima and 74,000 people in Nagasaki.
Barack Obama became the first sitting US president to visit Hiroshima in May 2016.