The Vow From Hiroshima is an intimate portrait of Setsuko Thurlow, a passionate survivor of the atomic bomb in Hiroshima. She was 13 years old when the atomic bomb was dropped (in Hiroshima) in 1945. Her moving story is told through the lens of her growing friendship with a second-generation survivor, Mitchie Takeuchi. 

Setsuko was miraculously pulled out of a fiery building after the bomb was dropped and unable to save her other 27 classmates who were burned to death alive. That experience shaped her life forever and she endeavored to keep a pledge she made to her friends - that no one should ever again experience the same horrible fate. 

The film follows Setsuko through her decades of activism up to the current moment when she finally achieves her dream of a Nuclear Weapons Ban Treaty.