Ranked #376

Darker than Black: Kuro no Keiyakusha Gaiden

Alternative Titles

Synonyms: Darker than Black: Ryuusei no Gemini Specials, Darker than BLACK 2 OVA, DTB
Japanese: Darker than BLACK -黒の契約者 外伝


Type: Special
Episodes: 4
Status: Finished Airing
Aired: Jan 27, 2010 to Jul 21, 2010
Producers: Square Enix
Studios: Bones
Source: Original
Duration: 24 min. per ep.
Rating: R - 17+ (violence & profanity)


Score: 8.131 (scored by 70,397 users)
Ranked: #3762
Popularity: #343
Members: 114,868
Favorites: 539
1 indicates a weighted score. Please note that 'Not yet aired' titles are excluded.
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.


Tells the story of what happened to Yin and Hei between the first and second series.


No background information has been added to this title. Help improve our database by adding background information here.

Promotional Videos

No promotional video has been added to this title. Help improve our database by adding a promotional video here.

Related Anime

Characters & Voice Actors

Kiuchi, Hidenobu
Kiuchi, Hidenobu
Fukuen, Misato
Fukuen, Misato
Hazuki, Mina
Hazuki, Mina
Saiga, Mitsuki
Saiga, Mitsuki


Wakabayashi, Kazuhiro
Wakabayashi, Kazuhiro
Sound Director
Yanagisawa, Tetsuya
Yanagisawa, Tetsuya
Nishimura, Hiroyuki
Nishimura, Hiroyuki
Ishii, Yasushi
Ishii, Yasushi
Theme Song Performance, Music

More episodes Episodes(1/4)

Episode Title Aired
1 Darker than Black: Kuro no Keiyakusha Gaiden 1
Jan 27, 2010

Opening Theme

No opening themes have been added to this title. Help improve our database by adding an opening theme here.

Ending Theme

"Can you fly" by Yasushi Ishii

Write a review | More reviewsReviews

Jun 26, 2010
This is the bridge between Kuro no Keiyakusha (Season 1) and Ryuusei no Gemini (Season 2). For those who watched both seasons THIS IS A MUST! In these 4 episodes they will explain the holes in Ryuusei no Gemini.

(Will update as season ends)

Story: 9/10

These 4 episodes explains about the gap in the 2 years between season 1 and season 2. Like before of DtB, the story is well executed and polished. It is based on the character development between Hei and Yin. Also answers many of the questions that were brought in season 2.

Art: 9/10

Amazing, I would say it is better read more
I found this review Helpful
Mar 21, 2010
With just one episode aired I believe we all more or less know what it's going to be about. So let me explain this a bit to those who haven't got their hands on the first episode yet.

Story : The story clearly takes place between 1st and 2nd season. As written above, it's main purpose is to shorten the gap between 1st and 2nd season.
If you've finished just 1st season, this is just like watching another episode of it. If you've seen 2nd season too, it's pretty much a flashback, but a very critically needed one. I myself was pulled in the story read more
I found this review Helpful
Dec 24, 2013

I'll keep this short: Anyone who is a fan of Darker than Black NEEDS to find a way to watch these 4 episodes; they are crucial to understanding so many things about the series, including several things that didn't make sense in season 2, the relationship between Hei and Yin, and Hei's character development.

The OVA bridges the gap between seasons 1 and 2, explaining what happened to Hei and Yin during that time, and not only is this information vital to the plot, it is incredibly entertaining. This OVA is 4 episodes of pure awesome, as we finally read more
I found this review Helpful
Dec 13, 2015
[b]DtB: KnK Gaiden[/b]
This is a nice follow up from the first season but obviously if you watch this first before Ryuusei no Gemini because this was aired one year after the 2nd season and for some reason i think the 2nd season will be different than i thought because of the cover with that girl with the sniper.

The story follows Hei and Yin in their attempt to run from the Syndicate, they now have a more deep relation of caring and even in love and in which they will have their own problems between them as now Yin has ''another'' personality that wants to take read more
I found this review Helpful


Anime: Rurouni Kenshin: Meiji Kenkaku Romantan - Tsuiokuhen
Both have very similar storylines .The protagonists are escaping from an establishment .Builds a base for the series to progress .High on action and emotions. 
reportRecommended by kaushik17
Anime: Ga-Rei: Zero
At first, both these animes have a similar drama component: in order to do their duty main characters have to kill their loved ones, however in Ga-Rei Zero drama is payed more atention to and is more deep than in DTB. Both these series deal with organisations exterminating threats to the mankind (ghosts in GRZ case and contractors in DTB case). Sure thing there are mystical powers and supernatural abilities included. Also, you will feel painfully sorry for main characters whichever you watch.
In case you watched DTB only because of action and fights, it's unlikely you will like GRZ. There is action  read more 
reportRecommended by lotrus28

Recent News

North American Anime & Manga Releases for May

Here are the North American Anime & Manga releases for May 2015 Week 1: May 5th - 11th Anime Releases Astro Boy (2003) Complete Series Denki-gai Collecto...read more

Side Story Episodes of Darker Than Black 2 Are DVD/BD Release Only [Confirmed]

According to dojin mangaka Guyohmaru's blog, Aniplex announced at a preview for the anime business people that four extra episodes of Darker than BLACK - Ryuuse...read more

Recent Forum Discussion

Poll: Darker than BLACK - Kuro no Keiyakusha Gaiden Episode 4 Discussion ( 1 2 3 4 )
maji_saikou - Jul 21, 2010
164 replies by Sherlockeb »»
Dec 30, 2015 12:09 PM
Poll: Darker than BLACK - Kuro no Keiyakusha Gaiden Episode 2 Discussion ( 1 2 3 4 )
ShanaFlame - Mar 24, 2010
166 replies by lakshika »»
Dec 28, 2015 1:39 AM

Recent Featured Articles

15 Astronomical Quotes from Darker than Black

15 Astronomical Quotes from Darker than Black

Darker than Black: Kuro no Keiyakusha is a gritty mystery/sci-fi set in an alternate version of Earth, where people with special powers, known as 'contractors', walk the streets beside normal folk. Here are fifteen quotes about these mysterious, rational beings.