A Love Song Sung from a Trash Heap... (Part 1)
Hei meets Sakurai Kenji of the Nakazawa Group, a clumsy yet ambitious young man. New characters are introduced who live in Hei's apartment building. Later, Kenji is given the assignment of taking care of a doll by his boss. Hei, Mao, Yin, and Huang try to find the doll, who is conveniently in the hands of Kenji.
Aired 27/07/2007EP 17 - A Love Song Sung from a Trash Heap... (Part 1)

2007
Darker than Black
In Tokyo, an impenetrable field known as "Hell's Gate" appeared ten years ago. At the same time, psychics who wield paranormal powers at the cost of their conscience also emerged. Hei is one of the most powerful of these psychic agents, and along with his blind associate, Yin, works for one of the many rival agencies vying to unlock the mysteries of Hell's Gate.
(Source: Anime News Network)