72 years after the end of World War Ⅱ, a group of about a dozen people visited Japan. They were born and raised in Vietnam yet consider Japan their homeland in some sense. Their fathers were Japanese soldiers who remained in Vietnam after the war, to fight for the country's independence from France. About 70 of these soldiers had families in Vietnam but suddenly went back to Japan without saying a word. The group from Vietnam arrived in Japan in October of 2017, chasing their fathers' shadows.

Setsuko Thurlow was 13 when the atomic bomb was dropped on Hiroshima. Horrific scenes of pain and destruction were burned into her memory. She moved to the US and Canada and began to tell the world what had happened in Hiroshima. Her work with the International Campaign to Abolish Nuclear Weapons (ICAN) overcame resistance from nuclear powers and resulted in the adoption of a UN treaty to ban nuclear weapons. Their efforts earned the group the Nobel Peace Prize. This gripping documentary follows Setsuko's journey from a childhood wracked by war to international recognition.