The gigantic, jet-propelled, killer flying turtle, Gamera, has met his match he meets up with Ayana, a teen whose parents were victims of Gamera's past destructive visit to Tokyo. When Ayana finds a baby flying reptile in the countryside, she decides to raise the little tentacled creature and name it Iris. But when she later learns that Iris is a Gyaos bird, the mortal enemy of the Gamera, she puts into place a plot of sweet revenge.