Detective Tominaga investigates the disappearance, focusing on Misaki's girlfriend, nightclub singer Chikako Arai.

Dr. Masada, a scientist, theorizes that hydrogen bomb testing in the Pacific has created radioactive, liquid mutants— H-Men —that can dissolve and absorb humans on contact.

The authorities eventually use flamethrowers to hunt the creatures through the Tokyo sewers after they attack a nightclub. Core Themes & Legacy The H-Man (1958) Movie Review

The story begins with a drug deal gone wrong on the rainy streets of Tokyo. A gangster named Misaki vanishes suddenly, leaving behind only his empty clothes and a bag of narcotics.