The plot: Returning from school, Kika walks in on her mom and uncle eating her dad. Never realizing her mother was a psychopathic cannibal, Kika is distraught, and her mom is still hungry. As her mom attempts to eat her, a meteorite propels through mom's torso. Now missing her heart, she rips out Kika's and places it in the hole in her torso. The ash from the meteorite causes millions in Japan to become cannibalistic zombies, which have antler shaped appendages growing out of their heads. As carnage spreads, southern Japan walls off the north to prevent the spread. Kika wakes up a year later in a government hospital with an artificial heart and the ability to kill these fiends. The voters of Japan are their own worst enemies as the families of the infected lobby for basic human rights for their unfortunate loved ones. A bill to consider the infected dead does not pass parliament. The citizenry chant "protect the infected, support human rights." The nationalistic south unleashes Kika into the north to kill the infected.
Kika, now armed with a cool weapon (half chainsaw, half Samurai sword) picks up some partners and they saw through the infected. Kika's mom is the "head" of the infected and a final showdown between the two is inevitable. As Kika attempts to save her country, the politicians and clergy in the north insist the infected are humans and must be valued. Uninfected citizens are forced to live three families to a dwelling as society falls apart, all in the name of a humane and happy Japan.