Darker than BlackDARKER THAN BLACK: Kuro no Keiyakusha
TV · Spring 2007
Mystery · Sci-Fi

DARKER THAN BLACK: Kuro no Keiyakusha - GaidenDarker than Black: OriginsDARKER THAN BLACK -黒の契約者- 外伝
Tells the story of what happened to Yin and Hei between the first and second series.