A young man named Nobuo Tanaka, who has come down with the flu. After receiving a flu shot at a doctor's office, he goes to work as a lab technician in a bio-research facility. At a colleague's insistence, he takes some experimental pills found on the facility's director's desk. The pills turn out to be part of a biological weapon program, reacting to the chemicals in the flu shot inside his body. Tanaka soon acquires a (literally) deadly body odor and becomes a walking weapon of mass destruction. After waking up from a nap, he finds everyone in the facility dead, though at first he thinks they are just unconscious. He reports the incident to headquarters and is instructed to deliver some papers and the experimental drug to Tokyo. The head of the research company and the Japanese military later realize that Tanaka is causing the poisonous gas and order him to be killed. The self-defense forces futilely attempt to keep him from delivering the experimental drug to Tokyo.

(Source: Wikipedia)