Darker than Black was first announced in December 2006, and its first trailer was released in March 2007. It was created and directed by
Tensai Okamura. Since
Darker than Black has an original screenplay, Okamura often considered changing the plot, something impossible with manga adaptations, due to the need for consistency with the source material. Okamura originally wanted the series to be called
BK201, a code name, but the anime staff considered it weak and
Darker Than Black was suggested by an
Mainichi Broadcasting System employee.
Darker than Black was the first anime series created by Okamura, who said that it took him several years. As a child he read manga about ninjas, spies and superheroes, and was particularly influenced by a
Shirato Sampei manga about ninjas which helped young readers learn the art of ninja; "the spirit and the atmosphere of the spy series that rocked my childhood", such as
The Fugitive, were other influences on Okamura's series. The handling of the two Gates prominent in the series' world building was inspired by
Roadside Picnic, a novel by
Arkady and Boris Strugatsky.
Writing The bi-episodic structure is based on the experience when Okamura worked as storyboarder in the anime
Cowboy Bebop. They have space to dig more on the new characters of each new arc. The series compositor of the first half is Okamura himself, leaving a lot freedom to the writers. The second half, since this original show needs to be put into an end, it is
Shōtarō Suga handling the role as his first time being a series compositor. The writer team consists of Shinsuke Onishi, Yuichi Nomura, Suga, Kurasumi Sunayama, and Okamura himself. Okamura wrote first two episodes as the first arc. He wrote them in advance to start off the series. Ohnishi was Okamura's acquaintance in previous works, the latter describes him: offering interesting script without speaking a word. Ohnishi is the most
Darker than Black spiritual writer. Every episode with detective comedy is handled by him which is Okamura's original wish to make a 1980s-like Japanese detective story. According to Iwahara, Hei was the most difficult character to draw; he struggled for a subtle balance when designing the character. Hei's black eyes were smaller, creating a cold impression, later becoming more expressive. Li, his civilian persona, was originally gentle-looking. Iwahara accepted the offer because he was interested in the project, and wanted to do something different after his previous serialized manga. Although he found the character sheets easy to do, he was daunted by the number of characters he had to create. Takahiro Komori adapted Iwahara's work for animation, retaining the essence of the original designs and making the animators' work easier; Huang's hat and Yutaka Kouno's and Mayu Ootsuka's clothing were changed. Colour designer Nobuko Mizuta was disappointed because much of the series is set at night and the main characters' clothing is generally dark-coloured, but she gave the guest characters brightly-coloured clothes. Komori said that when he draws female characters, he pays special attention to the line connecting her buttocks and legs. The series' first opening scene has a silhouetted nude woman following Hei, which had to be corrected in subsequent episodes. The artist had mixed emotions about sexualizing female characters but in the end decided to sexualize them to appeal to the audience.
Music The series' soundtrack was composed by
Yoko Kanno in 2007. The series uses four pieces of
theme music: two opening themes and two ending themes. "
Howling" by
Abingdon Boys School was used as the opening theme for the first 14 episodes while "
Kakusei Heroism (The Hero Without a "Name")" by
An Cafe was used as the second opening theme from episodes 15 onwards. by
Rie fu was used as the ending theme for the first 14 episodes while "
Dreams" by
High and Mighty Color was used as the second ending theme from episodes 15 onwards. The lyrics of "Howling" focus on Hei's characterization with Okamura commenting that parts of it delve into elements the character briefly saw. The soundtrack has 20 tracks, including the opening and closing themes performed by Abingdon Boys School and Rie fu. Other non-instrumental songs were written by Tim Jensen and performed by
Mai Yamane (tracks eight and 10) and James Wendt (tracks 14 and 19). It peaked at number 57 on the
Oricon albums chart. Tensai Okamura wanted 1970s-type folk music which would convey the impression of darkness. ==Release==