Darker than Black is a Japanese anime television series created and directed by Tensai Okamura and animated by studio Bones. 25 episodes were broadcast on MBS, TBS and their affiliated stations from April to September 2007. The series is set in a world where a spatial anomaly identified as "Heaven's Gate" appeared in South America and was followed by "Hell's Gate" in Tokyo, altering the sky and wreaking havoc on the landscapes. People with special abilities labeled as Contractors emerged shortly afterwards. The series follows agent Hei and his comrades in the Syndicate organization, operating in a vastly altered version of contemporary Tokyo to uncover the mysteries of Hell's Gate.