A crime story (with strong elements of comedy) that pits a determined detective against a gang of pickpockets in Osaka. The detective (played by Keiju Kobayashi) and the leader of the gang (played by Norihei Miki) have an interesting wartime backstory together that fuels much of the story.
During WWII, Germans obtain the immortal heart of Frankenstein's monster and transport it to Japan to prevent it being seized by the Allies. Kept in a Hiroshima laboratory, it is seeming lost when the United States destroys the city with the atomic bomb. Years later a wild boy is discovered wandering the streets of the city alone, born of the immortal heart.