Darker than Black: Kuro no Keiyakusha Gaiden

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Alternative Titles

Synonyms: Darker than Black: Ryuusei no Gemini Specials, Darker than BLACK 2 OVA, DTB, Darker than Black: Ryuusei no Gemini Episode 12
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
Licensors: Funimation
Studios: Bones
Source: Original
Genres: ActionAction, MysteryMystery, Sci-FiSci-Fi
Theme: Super PowerSuper Power
Duration: 24 min. per ep.
Rating: R - 17+ (violence & profanity)


Score: 7.941 (scored by 131114131,114 users)
1 indicates a weighted score.
Ranked: #6262
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #774
Members: 235,283
Favorites: 786

External Links

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Fleeing from the consequences of his decision at the Hell's Gate, superpowered Contractor Hei and his companion Yin take refuge in a quiet inn, adopting the guise of a married couple in order to not draw suspicion. In an attempt to recover from recent events, Hei befriends the inn's other guests. He discovers that one of them is a fellow Contractor tasked with killing him. Their resulting encounter spells disaster for both Hei and Yin, who are forced to fight for their lives and grapple with the emotional wounds sustained in their previous life together.

[Written by MAL Rewrite]


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Episode Videos

Related Anime

Characters & Voice Actors


Kiuchi, Hidenobu


Fukuen, Misato



Hazuki, Mina

Saiga, Mitsuki


Iwanaga, Tetsuya

Jie, Xiao

Minagawa, Junko

Sawasaki, Youko

Yoshizumi, Kozue

Kobayashi, Gorou

Ootomo, Ryuuzaburou


Kirimoto, Takuya


Matsumoto, Yoshirou


Nishimura, Hiroyuki
Ishii, Yasushi
Theme Song Performance, Music


Opening Theme

Apple Music
Amazon Music
Youtube Music
"Tsukiakari no Michishirube (ツキアカリのミチシルベ)" by Stereopony

Ending Theme

"Can you fly" by Yasushi Ishii

Dec 24, 2013
Link_of_Hyrule (All reviews)

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
Nov 14, 2011
kristen4444 (All reviews)
I really liked Darker Than Black. Not loved, just liked. What made me fall in love with the entire series was Gaiden. An OVA bridging the gap between the first and second seasons, it did not disappoint.

Story - 10:
What Gaiden gives is answers. A better understanding of what went down between Hei and Yin between the two seasons, and a good preventative of confusion before watching Gemini of the Meteor. It has all the amazing qualities of the first season, jam-packed with exciting, intense action and fight scenes, but also smoothly introduces a new chapter in the lives of Hei and Yin. A fantastic mix read more
Dec 24, 2014
Arsene_Lucifer (All reviews)
The first season of “Darker Than Black” left the exact fate of two of its central cast in an ambiguous state. This four part OVA continues the story past the first season finale while serving as the transition into the new direction second two would take in Ryuusei no Gemini. This OVA combines the strength of both season into a nice package telling a compelling story, interesting leading characters, and great action scenes.

Good: Fills the gap between seasons 1 & 2

This four part OVA can be summarized as a “couple on the run” sort of story. Hei and Yin are trying to survive daily life read more
Aug 15, 2010
SpudUK (All reviews)
First of all, I would like to point out here that I'm trying to make this as unbiased as I can, unlike one of the other reviewers (whose name I won't mention) who after just 1 episode already predicted that this would be great. Clear sign of a fanboy. I'll be reviewing it on the basis of it's purpose, i.e. answering the questions that left you confused or unanswered in Ryuusei no Gemini.

I'll go through the other sections first though.

The artwork in this is very much in keeping with the second series. It's sharp and well animated, if not a bit too dark at times, read more


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