Nobuo Tanaka, a young pharmaceutical lab technician, battles flu symptoms and receives a flu shot before his shift. At work, he mistakenly ingests experimental pills from his director’s desk, believing them to be cold medication. Unbeknownst to him, the pills—linked to a classified bioweapon initiative—interact with his recent flu shot, catalyzing a biochemical metamorphosis. His body begins emitting an odorless gas lethal to animals yet paradoxically stimulating rapid plant proliferation.

After napping, he awakens to a silent facility, assuming his coworkers are unconscious. Following protocol, he alerts headquarters and is directed to transport the experimental drug and documents to Tokyo. Oblivious to the toxic cloud enveloping him, he departs, inadvertently triggering mass fatalities across Yamanashi Prefecture, including Kōfu City’s 200,000 residents.

Military forces mobilize tanks, airstrikes, and wind-dispersal tactics, but the gas disrupts targeting systems, shielding him. U.S. operatives in pressurized space suits eventually ambush him, encasing him in a containment exosuit. Still unaware of his role as the outbreak’s source, he arrives at Tokyo HQ. When the suit opens, the gas escapes anew, annihilating the facility’s personnel.

Tanaka’s unwavering compliance with orders—delivering the pills, submitting to containment—clashes absurdly with his unintended genocide. His arc unfolds solely within the short film, depicting a hapless pawn ensnared by bureaucratic failure, where blind adherence to authority magnifies catastrophe despite his nonmalicious intent.