text: Early in the series Hei is revealed as a former fighter in the Heaven's War, searching for his missing sister Bai; he believes that a woman known as Amber is responsible for Bai's disappearance after escaping from the Syndicate. Amber leads Evening Primrose, a group of Contractors targeted by the Syndicate who claim they are terrorists. Pandora, another group, investigates Hell's Gate; the Syndicate is using Pandora and its Saturn Ring weapon to attack Hell's Gate and annihilate the Contractors. This creates mayhem as multiple Syndicate agents target Huang who ultimately commits suicide. Hei and Yin meet Amber while Mao escapes from them. Upon meeting Amber, Hei is revealed to be an ordinary human who became able to use Bai's power after his sister placed his body onto his flesh through her powers. When Saturn Ring is activated, all Contractors except Hei are killed. Hei has a vision where he meets Bai and decides to betray the Syndicate. Amber uses her Contract powers to revert time long enough to enable Hei to destroy Saturn Ring, and Hei and Yin escape from the Syndicate.
  Production
  Darker than Black was first announced in December 2006, and its first trailer was released in March 2007. It was created and directed by Tensai Okamura. Since Darker than Black has an original screenplay, Okamura often considered changing the plot, something impossible with manga adaptations, due to the need for consistency with the source material. Okamura originally wanted the series to be called BK201, a code name, but the anime staff considered it weak and Darker Than Black was suggested by an MBS TV employee.