In Imperial Japan, marriage between Japanese and colonial populations in Asia and the Pacific was encouraged for the sake of eugenically and ideologically strengthening the empire. After the defeat in 1945, the issue of "mixed-race children"—now between Japanese and US military personnel—engendered a moral panic, which resulted in the advocacy of ‘pure blood’ as the true strength of the nation. This incisive account shows, in sparkling prose, that whatever the target of this moral panic and wherever it was implemented, the underlying force remained nationalism and the object of sexual sovereignty was always the women—in Japan and almost everywhere else.