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2036. Tokyo, ravished by radioactive contamination caused by a nuclear power-plant accident, is now in lockdown. COPPELION—a special unit of Japan's Ground Self-Defense Forces' 3rd Division made up of three high school girls genetically engineered to be impervious to radioactivity—is sent in to search for survivors in Tokyo, a.k.a. "The City of Death."
When retired cop Hiraga Raizou gets a lucrative gig working for a shadowy government organization, he is in for a rude awakening. The first day on his new job, he comes across a grisly murder and a lone little girl who’s far from innocent. She’s Suzukaze Miharu, an 11-year-old master assassin–and his new partner! The arrangement is simple: she kills, he cleans up and hides any evidence. Sure, the pay is great, but how much blood is Raizou willing to get on his hands?