Darker Than Black: Kuro no Keiyakusha Episode 18

Ten years ago, a bizarre phenomenon appeared in Tokyo. Three days later, two types of humans with supernatural abilities appeared: emotionless dolls that only do what they`re programmed to and wield the ability of surveillance, and powerful contractors, feared and hated by the humans that know of their existence. Rationally self-preserving and without the feeling of guilt, it`s not long before contractors are used as ideal assassins and weapons of war.Unable to analyze the phenomenon that created these beings safely, it`s decided that a huge wall be built around it, called "Hell`s Gate." PANDORA, an international research group, protects this wall and analyzes what little they can, while the government struggles to suppress dangerous contractors and the publics` knowledge of them.In all the police force`s efforts and doll-assisted surveillance

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