oishi was able to talk to former child soldiers. he heard stories of unimaginable horror. >> translator: the armed militants forced us to transport weapons. they tortured and shot those who refused. >> reporter: he met another boy suffering from deep psychological wounds. this former soldier couldn't even hold a conversation. >> translator: people say this boy was nearly an animal when he was brought here. i see why they had that impression. i really felt his heart-rending cry. >> reporter: after returning to japan, he was determined to depict the slaughter taking place in congo and in graphic terms. >> translator: the depictions on these pages are very violent. do they have to gruesome? >> translator: the situation cannot be conveyed in words alone, but it's also too violent to show in photographs. that's why we thought using manga would be good. it's a question of how much of the brutality i witnessed can be expressed. >> reporter: in the beginning, zaza is reluctant to fire his gun. but in a short while, he is promoted to lead th

at first matashichi oishi thought it was a strange snowfall... the symptoms came later. >> my face turned black, and my skin started to fall off. but i concealed it from everyone because i didn't want my family and i to face discrimination. >> renewed nuclear fears manifested in cinemas that year: godzilla, raised from the deep by atomic testing, wrought indiscriminate destruction on japanese cities. but as japan began to build nuclear power plants in the 1960s, a very different figure emerged. astro boy was the epitome of moral science - the savior robot powered by a nuclear reactor. his creator always denied he was a pro-nuclear symbol. but the industry still used his image in pamphlets like this, in which he carries nuclear plant to a far-off jungle; where it saves freezing animals and survives an earthquake and tsunami unscathed. >> for decades as japan's economy soared, national confidence surged, and japanese factories fueled by nuclear energy exported products and know-how to the world - those sorts of promotional messages chimed with what