Darker than Black: Kuro no Keiyakusha Gaiden

Synopsis

Claude gives Yin an unknown substance which should make her unstable to fasten her awakening. He calls every secret organization in the world in order to set them up against each other. The Chinese Secret Organization is the first, to whom Claude sells Yin too. He throws the money out of the window. In the next scene, Hei is seen with the real contractor's body of the dog who helps him now because of Claude's irrational actions. They are able to enter the building, killing contractors in the process. Outside the building, several organizations are fighting each other just as Claude had intended...

(Source: Darker than Black Wiki)