In the year 2021, mankind was decimated by the epidemic Gastrea, a parasite virus, and is forced to live within the walls, which are created from Varanium: a metal that is able to subdue Gastrea. Soon, the cursed children, children born with the virus Gastrea you are able to control it, which gives them superhuman abilities are discovered. Because the virus Gastrea could be seen only in women. Civilians are formed to specialize Gastrea fighting, operating alongside an initiator and a fucking child and a promoter, used to take. Ten years after the epidemic, Rentaro Satomi, a high school student who is also a promoter along with his childhood friend and Kisara Tendo Enju Aihara initiator receives a secret mission to prevent the destruction of the Tokyo area.