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Darker Than Black - Kuro no Keiyakusha

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4.385 out of 5 from 26,059 votes
Rank #141
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Synopsis:

A giant wall looms over Tokyo, shielding the city from a dangerous otherworld called the 'Hell's Gate'. Within the city, things are no less terrifying because Contractors, psychopathic killers with phenomenal powers, have started to appear. These killers are compelled to pay a price every time they use their powers, often in the form of a meaningless or painful task. As their deadly habits rack up a gruesome death toll, Kirihara Misaki and her team from the Foreign Affairs Public Security struggle to solve the cases and bring the Contractors under control. Their task is further confounded by the interference of a masked individual they title Messier Code BK201, a man with abilities that allow him to fight and defeat the Contractors. Who is this BK201? How can the Contractors be stopped permanently? And what does the appearance of the Hell's Gate mean for the people of Tokyo?

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related anime

Anime Name Type Year Relation More Info
Darker Than Black: Beneath the Fully Bloomed Cherry Blossoms DVD Special 2008 Side Story Bonus episode released on the 9th volume of the DVD.
Darker than Black: Ryuusei no Gemini TV 2009 Sequel
Darker than Black: Kuro no Keiyakusha Gaiden DVD Special 2010 Sequel

related manga

Manga Name Year Relation More Info
Darker Than Black 2007 TBD
Darker than Black: Shikkoku no Hana 2009 TBD
Name Role
Takahiro KOMORI Character Design
Tensai OKAMURA Director
Yoko KANNO Music
Ryo OYAMA Producer
Yoshihiro OYABU Producer

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Official Editorial Reviews

Title Author Score Date
Darker Than Black - Kuro no Keiyakusha vivafruit 6.5/10 Dec 2, 2007

Community Reviews

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Title Author Score Date
Darker Than Black - Kuro no Keiyakusha HaslamMcladswag 9.4/10 Feb 12, 2014
Darker Than Black - Kuro no Keiyakusha IgnisVengeance 8/10 Sep 22, 2013
Darker Than Black - Kuro no Keiyakusha RoyalOtaku 7/10 Aug 20, 2013
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Anime Watchlist Ryanb23 41 Apr 18, 2014
Explus yasar 447 Apr 17, 2014
Top action anime lyllyean 18 Apr 13, 2014
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Top Anime Couples PurpleCatAngel 2 Mar 15, 14
Favorite OST's Kutatsu 0 Jun 3, 13
darker than black LostKitty 0 Apr 24, 13
Darker Than Black Viewing Order chii 0 Mar 15, 13
Animix lyhne 0 Feb 28, 13

Recommendations if you like Darker Than Black - Kuro no Keiyakusha

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Ergo Proxy

Ergo Proxy

In a futuristic world almost barren of life, mankind is confined to mechanized domed cities where A.I.’s control all aspects of life. In this world, humans are no longer born, they are manufactured in a production line; and alongside them live androids known as autoreivs. Within one of these domed sanctuaries named Romdeau lives Re-l Mayer, one of a few citizens who aren’t entirely prevented from thinking. Her grandfather's prominent position and the affection of the scientist Daedalus have left her more free will than is normally allowed, but Re-l has started to question the sanctity of the city and the citizens' perfect way of life. With mysterious beings known as proxies causing havoc and a man named Vincent causing great influence on her life, Re-l must travel outside of the city to find the answers she seeks and discover the mystery behind "the awakening".

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I agree...
18 people agree
colettelabete

Both series are set in an alternate dystopian future, where a natural disaster has forced humanity to protect itself inside dome cities (Ergo Proxy) or behind the Wall (Darker than Black). Also, both of them revolve around a good-hearted and kind male character, but whose past may be darker than it seems.

scenthr

In Darker than Black and Ergo Proxy, the main characters are in the process of discovering themselves; both are unaware of their powers and the paths which destiny has picked for them. Both anime are set in a post-apocalyptic future when humans are trying to rediscover their humanity and struggle to find their way. So of course if you watched one you will love the other for sure. I recommend watching them both as they are really good anime.

SurrealWraith

Darker Than Black and Ergo Proxy share similar tones and themes. In both, conspiracy and corruption plays a large role, as well as discrimination against certain groups of people. Both have a rather dark and sinister feel as far as anime go. In each, the main character must overcome many obscure obstacles to ultimately find himself.

Iahel

An atmosphere of darkness and mystery flushes both of these series. Until the end you won't know BR201's enigma and Vincent's raison d'être. The main character in Ergo Proxy and Darker Than Black live a double life, they have masks which hide their true faces. But not only similar characters put these titles together. The worlds described in DTB and Ergo Proxy are results of great catastrophes, connected with the main characters' destinies.

SteinbergerGPPRo

Both Ergo Proxy and Darker Than Black have a generally dark theme to them. Both the main characters are badasses, both shows leave a lot of questions in the air and force you to have to make inferences for it them make sense.

hirtue

I totally can't help saying that both series have a very similiar, dark and mysterious mood. They might seem different in many ways, but the atmosphere is really alike in both, so you should really check it out!

tasanime

There is this underlying element of mystery behind the central male protagonists in Ergo Proxy and Darker than black, protagonists who despite their undeniable fighting ability and supernatural force have little awareness of the source of such power. What is interesting is really watching these characters evolve in understanding of capability, origin, the outside world and their relationships with others - oft producing a more humane side to them. And while all this is going on, you're treated to a host of battles, missions and political/organisational influence throughout.

Dissolute

If you like either one you should like the other, due to the number of similiarities for example, both series share similar features in mood,protagnatist and theme/settings.

They both are set in a post apocolypic setting, although the reasons for the decline are very different and so are the background cities,surroundings and stylings themselves.

They both have a male lead who has a hidden past, which contains the secrets to their power, and the journey to discovering that past, and the reasons behind it, are a big part of the stories.

Both have a darkish and sombre mood, although Darker than Black does have some lighter moments with some sideline characters, while Ergo proxy has some minor upbeats with some of the more main characters with regards to Pino and Re-L and some bizarre humourous episodes.

The biggest difference I would say is that Ergo proxy has some very surreal episodes, and many (although minor and hinted, more often than not) references to psychology and socialology. These can be very thought provoking, however they are never really touched in great depth only surface scratched and more teased in some respects, almost like the easter eggs you get in games sometimes that relate to totally different things. This can be viewed as either a good thing (thought provking anime!) or a bad one, if they were going down the whole human psyche route why didn't they go the whole hog and not just skim around it?

Either way if you like one give the other a try you might be suprised!

crystalphoenix

Darker Than Black and Ergo Proxy both have relatively complicated storylines. Both the protagonists are trying to discover who they are. They are different though in the aspect Vincent (Ergo Proxy) must learn, well rediscover, who he really is, where as Hei (Darker Than Black) must accept (and decide) who he really is. Both societies in the shows are sheltered by their governments in that the information is censored. Ergo Proxy is more like a society in The Anthem by Ayn Rand in that the government has made the people into a collective and there is no such thing as I. Ergo Proxy is a journey of self discovery. In Darker Than Black the government tries to control the contractors. Similarly in Ergo Proxy the government tries to control the spread of the Cogito virus. Both series require the viewer to watch them entirely for the viewer to truly grasp the meaning of the series. Darker than Black however lacks some of the depth found in Ergo Proxy, which makes it easier to follow. Both series are amazing and beautifully done. They contain strong plot lines and keep the viewer intrigued. If you like one you will like the other.

absolute

Darker than Black and Ergo Proxy share very similar elements. Both the series are about a male protagonist who struggles thanks to their secret inner skills and they have a double.

Moreover the settlings and even side characters are very similar, being in a kind of future where strange supernatural events occurred.

stingreis

Ergo Proxy had a lot of philisophical aspects that made it unique among "end of the world" anime's however Darker than black with its "After a Major Disaster" type of anime, compares to Ergo Proxy with action and supernatural abilities. Both anime's have a lot of things going on and are slow progressing in some points, but are enjoyable to those that have watched the other and liked it

Orre

Both of these anime are set in worlds in which some degree of catastrophy has altered the status quo, though Ergo is much more extreme in this respect. Both series also feature "secret agent" type main characters that, while in the course of their normal missions, become caught up in situations that are much larger than themselves. With complex plots that leave the casual viewer in a wake of confusion, both of these anime are likely to delight anyone looking for an action-oriented series with a somewhat deeper experience.

eaper

These series have similar main characters, some similar themes, and a very large mystery going on in each of them. If you like questions of equality, reality, and a large, overarching mystery in your anime, these fit together well.

Dario97

Both series are set in a post-apocaliptic world. Also, both of them got kind and good main character, but they past isn't so kind. If you watched one, there is a high possibility that you gonna like the other one :D

Blaha41

both shows are what it is like to live in a hopeless world (Ergo Proxy more so) and both shows are completely incomprehensible until nearly the last episode. 

Sachi

Both have a knack for setting your view of the storyline slightly askew. The anti-hero setting is balanced well with the other elements of the story, so you're not just following the daily life of a psychopath.

parkitwonka

Both shows center around two similar characters(Hei and Vincent). In addition, both shows follow a similar directing style where bits and pieces of information are given, and the audience is then left to put them together. If you like one, there is a good chance that you will enjoy the other.

Starlightstar

Both are similar genre and both have a more mature feeling to them. Darker than Black Kuro no Keiyakusha is a lot shorter than Ergo Proxy. If you like dark, and mature sci-fi you'll love both of these.

watch it online now!

Phantom ~Requiem for the Phantom~

Phantom ~Requiem for the Phantom~

A young man awakens in an abandoned warehouse with no memory of his past. As he leaves the room and ventures further into the warehouse he is attacked by a girl in a mask; she tells him that in order to live he must come at her with all his might. After a fight for his life, he manages to overpower the girl, learning that he is to be trained as a Phantom - an assassin for the Inferno organization. He is also given a new name: Zwei. For three months, Zwei is trained by the girl in the arts of assassination until he has just one final test: to kill a living human being.

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I agree...
18 people agree
ZetsumeiTsumi

If you like the mysterious theater mask-wearing assassin that everyone fears but has a conscience, you will definitely like this one.  Both are well-thought out and you will see a lot of similarities between the two series.

Itochan60

having just watched both series back to back, it's easy to draw a lot of parallels between darker than black and Phantom ~Requiem for the Phantom~.  Both series have a similar dark tone. They also both follow a main character who follows mission and preforms assassination.  If you liked either series, it's hard to believe that you wouldn't like the other.

Wolfbrotherm

If you liked Darker than Black or Phantom, you will like the other because these are animes that give you a dark and mysterious feeling. Both the main male characters are much alike, and are in an organization which they have to obey.

Saeros

Because the atmosphere is similar in both animes.

They bith feature strong cool and remorseless main character and are dark themed

Pocky

Same character  same lead design wearing masks and such being controlled by underground organization both of the series uses assasins the only difference is darker than black is much more based on fantasy realm using superpowers  while on Phantom is more on real life mostly relying on skill and more dark background, both series are very addicting and have interesting characters it makes you want to crave more episode each episode

ValkyrianSteel

Both involve characters being controlled by a certain organization where both of the main characters struggle to obey or make their own decisions.

Vague

If you like the whole badass, painted mask assassin turned good concept than both of these series are right up your alley. Both series have a similar feel when it comes to artwork and fight scenes and quite frankly it rocks. I think Phantom's story is a little bit more interesting, but if you liked one I almost guarantee you'd like the other.

Panma

Both storylines offer twists and turns. Phantom and Darker than Black are both set in an underground world of mysterious characters and hidden plots. The action sequences are also very similar, with a large focus on speed-packed sequences with large build ups and quick post-climaxes.

MOJ

Darker than Black and Phantom share a wonderful, multi layered story as well as a very complex protagonist who are similar in many ways. Both revolve around assassins, mercinaries and the general underground of their respective worlds. Darker than Black does have much better fight scenes and really creative fighters but Phantom has an easier plot to go with and understand

Nitz11456

Darker than Black and Phantom are series that have characters who are being used by a shadowy organization for assassinations. Both series have a dark tone and an element of mystery.

hoggersying

The main male lead is similar in each show.  Each show also features high-octane action sequences and deals with a mysterious evil organization.

BronzeAge

To me, the most important similarity is that both series share the dark mood of lonely small group of friends / relationships against the world.

Another important factor for me is that they successfully combine the action packed missions to slowly reveal an obscure story / physics of their reality.

This is of course, besides the fact that both series follow the contract assassins working for secret organizations that have no regards for their own members.

TheVoid

The main theme is assassination. In addition, the characters have a similar persona, in that they have a goal to reach and undergo drastic character development to reach that goal. Hei and Zwei are both also controlled by a system, and are not just mindless brutes killing, but rather killing because they have to: in Zwei's case it was kill or be killed and so as he states: ''I kill....in order to survive, I kill''. Hei is more silent than Zwei though, however they are both characters with good intents; Hei certainly gives you the same on-screen feeling that Zwei does; the feelind of mysterious radiating power. Zwei and Hei are also both very formidable, especially in their roles as protagonists, and are unlike other leads in the aspect of not being (as what some people would deem) 'too powerful/overpowered'. Hei has the ability to manipulate static: but unlike other powerful characters in the show he is rather 'underpowered' for a contractor as he can only kill with static in either melee range or when he has a strong conductor (otherwise the target will not die - as in one notable case). Hei and Zwei primarily relie on their instincts and reflexes to guide them. Both protagonists also have a female companion or friend to guide them (Ein and Yin/Amber). The main trait of these anime which leads to their similarity is the 'dark undertone' feeling you get, coupled with the unpredictable transpiring of events.

kayelyn08

The main theme is assassination. In addition, the characters have a similar persona, in that they have a goal to reach and undergo drastic character development to reach that goal. Hei and Zwei are both also controlled by a system, and are not just mindless brutes killing, but rather killing because they have to: in Zwei's case it was kill or be killed and so as he states: ''I kill....in order to survive, I kill''. Hei is more silent than Zwei though, however they are both characters with good intents; Hei certainly gives you the same on-screen feeling that Zwei does; the feelind of mysterious radiating power. Zwei and Hei are also both very formidable, especially in their roles as protagonists, and are unlike other leads in the aspect of not being (as what some people would deem) 'too powerful/overpowered'. Hei has the ability to manipulate static: but unlike other powerful characters in the show he is rather 'underpowered' for a contractor as he can only kill with static in either melee range or when he has a strong conductor (otherwise the target will not die - as in one notable case). Hei and Zwei primarily relie on their instincts and reflexes to guide them. Both protagonists also have a female companion or friend to guide them (Ein and Yin/Amber). The main trait of these anime which leads to their similarity is the 'dark undertone' feeling you get, coupled with the unpredictable transpiring of events.

blackmesaboy

Both DTB and Phantom are about a powerful individual working for a shadowy organization. They both deal with the main character having doubts about the organization they work for and their position in it. DTB deals more with superpowers and fighting between people who posess them while Phantom deals with assassins doing their organizations dirty work by taking out targets. When it comes to dark action anime DTB and Phantom are 2 of the best I've seen and if you like one you'd probably really enjoy the other.

Shinsengumi367

Both anime are about assassins who don't exactly think like humans, more like puppets. Of course, I think that Phantom has a darker theme to it as it really enhances about how the main character wished he hadn't killed people.

alexzaharia

The general feeling is the same, the characters are also very similar in a lot of ways - rational and brilliant killers, tormented by their fate. I believe, however, that Phantom has much more deeper psychological implications as well as a more romantic feel to it. The main characters become very close and develop complex feelings for each other. This also happens (slightly) in Darker than Black but, in this case, the relationships are more frigid, since Dolls and Contractors are not actually capable of having warm feelings. All characters from Phantom are much more human and establish profound relationships. The plot is also more intricate in Phantom's case although both series deal with 'underground' organizations.All in all the series are very similar, although, from my point of view, Phantom is at least one star higher. 

RAQ154

If you like the mysterious theater mask-wearing assassin that everyone fears but has a conscience, you will definitely like this one.  Both are well-thought out and you will see a lot of similarities between the two series.

watch it online now!

Death Note

Death Note

Have you ever felt like the world would be a better place if certain people weren’t around? Such grim daydreams might occur when watching the dismal daily news, but on one fateful day, Light Yagami finds that these daydreams can become reality. By pure happenstance, he comes across a black notebook entitled "Death Note", whose text within states that whoever's name is written on its pages will die. With the aid of the death god Ryuk, Light takes it upon himself to rid the world of its corruption, ushering in a new era of purity one death at a time. But as Ryuk foretells, Light's actions will not go unchallenged...

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colettelabete

Both series revolve around morally ambiguous characters who are difficult to be cared for yet are intriguing. Also, the supernatural elements of Death Note might be appreciated by fans of science fiction series, such as Darker than Black.

Charlequin

Both of these series are very dark, and don't create comic moments just to save grace with the audience. They create a very complex picture, with the pieces slowly being fit together as the series progress rather than the facts being given to you (If either of these series doesn't make you go 'ehh?' at one point, you're a genius).

The art in both series is incredible, both with a cast of characters that is well developed and with a leading man that you sometimes love and sometimes want to hate (Raito in Death Note, Hei in Darker than Black).

Both of these series have fantastic, gripping storylines, with Darker than Black being the more action-oriented of the two (however, fight scenes are not placed in for no reason, and are always well done). I suggest if you liked Death Note, that you give DtB a try, as it is a really under-appriciated anime. And if you've watched DtB and haven't seen Death Note, don't be put off by the over enthusiastic fangirls. This is one anime you do NOT want to miss.

UltimateShinobi

Both anime have a very dark setting and themain characters both lose their humanity at some points (More Light than Li) while Li gains his humanity Light loses it.

BRID

Both these animes have the similarity of the main characters. Light and Hei.These main characters are act very friendly in the real world but in there head they are a completely different person. both characters think they are doing right in there own moral standpoint.Both of these animes have a very dark feel to them.although i think darker than black has a lighter feel to it then death note. but if you like dark, thought provoking animes with a mysterious main character then u will like these animes. 

dyhl22

Both Darker Than Black and Death Note, have superb storylines. Both have unpredictable plots and makes you want to know more what is going to happen next.

HollowNobody

Both Darker Than Black and Death Note are set in dark cities where death is around just about every corner.There are also similarities in that the main character in both shows seems to play a sort of anti-hero role and both characters are being constantly hunted down by law enforcement agents.

eaper

What makes anyone like either of these series can be found in both of them: They both have "anti-heroes" who slowly evolve into characters with very different out-looks, they both have extremely elaborate plots, they both have characters that hide their true identities while getting very close to enemies, and they both have super-natural elements. 

animerules201

Anime with hard core violence and different paths in life and different ways to survie are no what people might expect. So if you want to know what that really is... you schould watch this too!

anosora

Death Note is as dark as DTB are both very dark. The atmosphere is so similar that you'll love Death Note. You'll like the antiheroism.

batmannoLuckysocks

Both have a dark morally ambiguous (bordering on evil) protagonist who develops a sort of relationship with the person that's trying to catch them. If you like one chances are you will enjoy the other.

darkside90

Supernatural, psychological thrillers. very intense plot and great character development. The stories are great.  Deathnote is more dark though.

Tsukiko18

They both have similar dark storylines. I personally prefered Death Note over Darker Than Black, but either way they are both wonderful animes

saikablade

Both are dark and mysterous and although the plots are very diffrent many of the charactures are simimilar. Both have that element of the supernatral that keeps people guessing and both have that " whats going to happen next" excitement to it.

Sachi

Both the series deal with moral issues with the 'villian' as the protagonist. Because of this the 'good guys' are the antagonists and you find yourself rooting for the killer more than the police. They both provide an interesting outlook on the 'villian's' point of veiw. In addition, both create a air of tension and suspense, as the plots are quick-paced in terms of action, as well as complex enough that as a veiwer it is not obvious where it will lead. This is all pulled together with scarily stark and accurate artwork, making both series dark. You get all the feel of a seinen in a shonen. In short, if you like having a dark villian as the protagonist in a realistic and complicated setting, either one of these amazing shows would work for you.

watch it online now!

Witch Hunter Robin

Witch Hunter Robin

STN is a secret organization charged with capturing witches of all ages who misuse their inate ability of the Craft. Its newest recruit is a young girl named Robin, who wields the same power that she is helping to control. While skillful at their ability to detain quickly, the number of witches keeps seeming to increase, and the misuse of power grows stronger, casting a shadow of doubt as to what is really going on. For STN, there is much work ahead, and for Robin, her troubles are just beginning...

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I agree...
11 people agree
DarkWings

Both Witch Hunter Robin and Darker Than Black are very similar. Why, you ask? It's simple: they're both dark anime that have to do with the real world, except that there are a few select beings with powers. Some are violent, some are good. Then there are normal citizens who are caught in the middle of all of this. Both have secret organizations who are trying to take out the people with powers, too.

hedgehogblues

Both shows are about the supernatural and are dealt with in an intelligent way. Both are slow-moving to start, but Darker than Black is split into 2 episode chapters throughout the series with hints of an underlying plot (can't comment on the end until it comes out), whereas WHR starts out episodic but becomes linear as the main story kicks in.

tbkba

Both WHR and DtB have a similar plot involving the life of people with extraordinary powers, their hardships and desires. Although the worlds' whereabouts are different, the problems the main heroes face are quite similar.

Rhesian

Both have a supernatural protagonist trying to find his/her place in a shadowy organization. Pacing is somewhat similar... the first half of each series provides small glimpses into their abilities while the second half explores the underlying plot. Overall, DtB is the "tighter" story even though both have a less-than-concrete resolution.

fairyskisses77

Both are relatively dark and slow-paced stories about the supernatural and agencies that deal with them. Both have protagonists that should, technically, be on the other side, but who you nevertheless begin to care about.

If you liked one, you'll probably like the other.

neutrino

Once again, secret organizations, superhuman powers, public ignorance, and the choice given to the protagonist to fight for or against humanity.  Both are arc-based, monster-of-the-week types at first, before delving into the story, which detracts from both, however, each has an intruiging premise and style that up its watchibility.

stingreis

Well, Both anime's focus on a supernatural power, whether witches or contractors... Both the protagonists are part of an organization that they work for in episodic sequences they carry out their mission... and the endings are similar in many ways as well... though I will not ruin it...

In my opinion, darker than black, and Witch Hunter Robin are probably the closest reccomendations to each other than any others... please, if you enjoyed one this anime... watch the other.. cause you will like it as well

JAhU

There is something sad about most of the stories in WHR and DtB. Also both feature ruthless beings with supernatural powers (witches in WHR and contractors in DtB). Can't quite name anything elese, but chances are you might like one if you liked the other.

Nightfire320

Both series are a lot similar when it's about people with special powers. They both also portray how having special powers can be trublesome. In general they are quite similar so worth checin out

norco

Secret organizations, magic powers and a sort of withdrawn central character give each of these shows a very similar feel. If you like one there's a good chance you would like the other.

Brino

Hei und Robin seem emotionally distanced and are both psychic gifted in some way. The whole mood is depressed, and both soundtracks underline this feelings. Both series deal with psychics and secret societies and aim for a more grown up audience.

Cowboy Bebop

Cowboy Bebop

Follow interstellar bounty hunters Spike Spiegel and Jet Black as they scour the galaxy for criminals with prices on their heads. Hoping to escape their past, they live on the spaceship Bebop, but it's a dangerous business and old enemies don't forget easily. Allies come from unlikely sources, however, as they find comrades in the beautiful swindler Faye Valentine, the genius child hacker Ed and the genetically engineered 'data dog' Ein. Will they be able to help each other though their respective struggles, or is their fate really inevitable?

my list:

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I agree...
10 people agree
kmull

For most people, I really don't think this recommendation will work the other way, as CB is much better than DTB on so many levels. The main similarity is that each episode focuses on the main characters chasing a bounty or carrying out a mission, with the episodes in the series being loosely linked. Hei (DTB) is a mellower (and less destructive) version of Spike (CB), and they have similar relationships with Mao and Yin, and Jet and Faye, respectively.

tasanime

Cowboy Bebop and Darker than Black are great sci-fi anime, similar mostly in the structure of the characters and their personalities/roles. They are equally enjoyable to watch based on genre but if you really enjoyed the more humanistic approach to these series, than I'm sure you'll enjoy one as much as the other.

neutrino

These two stories, while superficially unrelated, are closer than one thinks.  One might argue that DTB was trying to bank on the success of CB's storytelling.  Both have a jazzy soundtrack, an incident-based story, and recurring characters.  However, CB pulls it off much better.  If you wanted to watch DTB for its "unique" approach to storytelling, you're better off with CB.

DeathCrunch

Both series are set focoused arouned around a motley crew of abrasive personalities that, when mixed together fit perfectly and get the job done.

A strong Sci-Fi current runs through both series, abet in diffrent ways.

Both main characters are introverted guns for hire, all to make ends meet until they can avenge their lost their loved ones.

azanimefan

Both anime are great examples of a "Film Noir" narrative style which is quite distinctive.  Both are episodic to a point (though darker then black focuses on 2 or 3 ep mini arcs, while Cowboy Bebop is mostly 1 or 2 ep stories), and both are "adult" action anime.

JAhU

Darker Than Black, borrows quite a few themes from Cowboy Bebop. Some arcs in both shows have similar story. Both feature a group o mercenaries (more or less) who work together. To keep it short, if you liked DtB, you should watch Cowboy Bebop as well.

doremouse

You don't have to be an expert on "Cowboy Bebop" to spot some parallels between it and "Darker Than Black". It's kind of an additional fun, spotting them..

Music by Yoko Kanno creates somewhat similar mood.

Aranneas

This is a rec based more on style than on anything else. There's not much commonality in terms of plot, structure, characters, or setting. However, both shows draw heavily on the conventions of film noir, match an overhanging darker tone with brighter moments and situational comedy, and explore a number of shared themes relating to redemption and forgiveness.

TARose

For starters the mood between the two just seems the same. the music, the episodic nature, and the crew work together in teh same ways. If you liked the darkness of CB and its fast paced action scenes, you will like DTB as well. 

TheEpicStickMan

Both Bebop and Darker than Black are great animes in their own rite.  Both have independent groups of fighters or another and both have great dramatic moments with decent action.  What they also have in common is that both don't have a whole lot of central story.  For the most part there are side stories that make up the series.  But with a memorable cast, it sure makes up for it.