Shintaro Fukuhara — known affectionately as “Shin-san” — tells Hiroshima’s wartime story on two wheels.

His daily bicycle tours carry an added weight with the approach of Aug. 6, marking 81 years since the U.S. atomic strike on the city. On any given afternoon, the 55-year-old leads streams of international travelers past the steel-ribbed ruins of the Atomic Bomb Dome, navigating modern streets built directly over the ashes of 1945.

As a hibaku nisei (a second-generation atomic bomb survivor), Fukuhara brings a living perspective that stationary museum tours simply cannot replicate. He tells the story of the bombing through a deeply personal lens: that of his mother, who was exposed to the bomb’s radiation in the womb, and his grandparents, who survived the attack.