It is 1948, three years after the atomic bomb devastated Hiroshima and much of the Nakaoka family. Gen Nakaoka, his mother, and his adopted brother, Ryuuta, fight to survive in the ruins of their formerly thriving city. Yet, after making friends with a group of homeless orphans, Gen comes to realize that, in many respects, he is fortunate. As radiation sickness and the callous behavior of foreign troops continue to impact Hiroshima, Gen and Ryuuta must draw strength from within if they are to ever hope for a better future.