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From FairGame (JCafe24): In kyoto, the ominous black mass is found but it was actually digested human body. Army Special Forces, Yuuko Sakaki saw it and ordered the evacuation order for residents. The one who ate those humans are alien, whom came with meteorite in heian periods. Yuuko was the one who was responsible for exterminate those aliens, and battles for extermination are about to begin.