The story follows agent Hei and his Syndicate companions as they investigate the secrets of Hell’s Gate in a post-apocalyptic Tokyo. Contractors, people with extraordinary powers, appeared shortly after. The series takes place in a world where “Heaven’s Gate” arose in South America and was quickly followed by “ Hell’s Gate” in Tokyo, changing the sky and causing devastation on the terrain. From April through September 2007, twenty-five episodes were shown on MBS, TBS, and its associated stations. Tensai Okamura conceived and directed the anime television series Darker than Black, which was animated by studio Bones.
