Darker than Black: Kuro no Keiyakusha

The series progresses in two-episode mini-arcs up until the satisfying finale. The episodic feel just goes away after some time as they all neatly come together towards the end. This anime is highly recommended, but be warned that it is pretty dark, detailed, and complicated, so prepare to work your brain cells! Overall, DTB is extremely interesting and entertaining, especially for fans of the genre.

Darker Than Black (TV Series 2007–2010) - IMDb

Darker than Black: Kuro no Keiyakusha

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Darker than Black - Wikipedia

Darker than Black- Kuro no Keiyakusha. 2007