
A near future, where humans have been defeated by the viral parasites named Gastrea. They have been exiled into a small territory and live in despair, side by side with terror. In this world trapped in darkness— Rentaro, a boy living near Tokyo and member of the "Civil Security" – an organization specializing in fighting against the Gastrea – is used to accomplishing dangerous tasks. His partner is Enju, a precocious young girl. They fight thanks to their peculiar powers un