Darker than Black: Gaiden OVA

Also known as:  Darker than Black: Kuro no Keiyakusha - Gaiden, Darker than Black Side Stories, Darker than Black Side Story, Darker than Black OVA

The side story OVA Darker than Black: Kuro no Keiyakusha - Gaiden recounts what happened to the main character Hei, in the two years that have been left unexplored between the first and second TV anime seasons. The videos are being bundled with the even-numbered Blu-ray Disc and DVD volumes of Darker Than Black: Ryuusei no Gemini (the second season).

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Producers, official website and other details: AniDB, ANN, Wiki