Stink Bomb
Lab technician Nobuo Tanaka, battling the flu, mistakes some experimental pills for medicine and swallows one. The pills were intended to help soldiers counter biological weapons, but it reacts to a flu shot that he had received before the medicine, causing his body to produce vast amounts of a highly toxic gas. While taking a nap, the odor he emits kills everyone in the laboratory. Horrified, he reports the incident to headquarters, who instruct him to deliver the experimental drug to Tokyo. Nobuo has become a living weapon of mass destruction.
Meanwhile, the odor he emits grows stronger to where it affects several miles of the surrounding area, killing every animal that breathes in the gas, though plants survive exposure to the unknown chemical agent and appear to be strengthened by it. The toxic gas is so potent that neither gas masks nor NBC suits offer any protection against its effects. As Nobuo travels through Yamanashi Prefecture, the deadly odor kills all animal life in its path, including all 200,000 residents of the city of Kōfu. Nobuo continues his journey towards Tokyo, unaware of the deaths he is causing, but the rest of the country is in a complete panic. The head of the research company and the Japanese military deduce that Tanaka is causing the poisonous gas and order him to be killed. The Japan Self Defense Forces try in vain to stop Nobuo with the use of artillery and missiles, but the chemicals interfere with the targeting systems of their weapons.
The U.S. military, who have been observing the situation to that point, invokes the U.S.-Japan Security Treaty to take over the operation to recover Nobuo, and calls in a NASA unit with space suits to try and capture Nobuo alive. After Nobuo enters a tunnel, the Japanese army collapses part of the bridge and the tunnel behind him, trapping him with only one way out. They turn on wind generators in an attempt to stop the odor's advance. As the soldiers in space suits approach Nobuo, he becomes scared and more of his odor bursts out of him, disabling the lights and wind generators.
After the cloud settles, the soldiers appear to have subdued Nobuo. One of the suit-wearing soldiers is escorted to the military headquarters in Tokyo and delivers the drug. The soldier opens their visor, revealing that it is actually Nobuo, who was placed inside the suit by one of the other soldiers, but is still unaware of his condition. He then fully opens his suit, killing everyone in the room.
