Three years after the Hiroshima bombing, Gen and his adopted brother, Ryuta, befriend a group of orphans. A fierce typhoon hits the city, leaving the orphans' home flooded and beyond repair. Gen helps them build a new home on an abandoned piece of property, and brings love and encouragement to one of the children whose face has been badly scarred by radiation. Gen's mother, though, has only four more months to live...

Source: IMDb

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Prequel: Hadashi no Gen