At the close of WWII, Kamikaze pilot Kōichi Shikishima (Ryunosuke Kamiki) disgraces himself by failing in his mission and returning to an airbase on the island of Odo. That night a local monster of legend: Godzilla rises from the sea and kills most there with Shikishima surviving again when he is too cowardly to turn the guns of his plane on the creature and instead hiding.
Returning to the mainland he finds his parents are dead, killed in US air raids that destroyed almost everything.
Poverty and despair abound but he takes in a young woman Noriko (Minami Hamabe) who clutches an orphan child and the pair build an unusual family unit among the ruins. He takes a dangerous job working on a minesweeper clearing the seas around Japan of the unexploded weapons of war.
Now just as hope begins to blossom Godzilla returns, seemingly huge now and attacking shipping until the US withdraws leaving Japan to face the threat alone.
Shikishima's war is not over.