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After a [[ZombieApocalypse vampire apocalypse]] is narrowly averted in Hong Kong, humanity's greatest defenders, who are mostly vampires who joined the humans against the Kowloon (pronounced kuu-lahn) children, disappear. During the next few years, a safe area for vampires is set up in Japan; it is called the Special Zone.

The series starts 10 years later as Jiro Mochizuki, one of humanity's greatest defenders, and his young brother Kotaro approach the Special Zone looking to move in. Unbeknownst to them, not all of the Kowloon children were killed in the Hong Kong Crusade. Some are after Jiro's life in revenge for his role in their near-extinction.

And theirs is not the only plot in play.

The series originally started out as some [[LightNovel Light Novels]] by Kōhei Azano and art by Yuuya Kusaka. In 2006, a 12 episode anime based on the book was created by Studio Live and Group TAC. It has been licensed and released in America by Creator/FUNimation. In July 2015, the English dub started airing on U.S. cable network Chiller TV, a horror themed sister channel to Creator/SyFy, as part of their late night Anime Wednesdays block.

Not to be confused with BlackBlood, a trope about censoring blood, or ''TheBlackbloodAlliance'', a webcomic.
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!!''Black Blood Brothers'' provides examples of:
* AllThereInTheManual: Most of the back stories of some of the characters is explained in the novel. Though since they're Japan exclusive, [[NoExportForYou outside the country you are out of luck.]]
* AmbiguouslyGay: Rinsuke Akai
* AnAxeToGrind: Auguste, but later he switches to a saber.
* AuthorityEqualsAsskicking: Almost all higher-ups in the Order Coffin Company (which manages the Special Zone) are heroes of the Hong Kong Crusade.
* BadassLongcoat: Jiro wears a red one.
* BattleButler: Caine, though his master went...[[FaceHeelTurn off]].
* BerserkButton: Kotaro, and later Mimiko, for Jiro.
* BetterThanSex: Sex apparently pales in comparison to the sensation of [[KissOfTheVampire getting bit by a vampire]].
* BigOlEyebrows: Caine all the way.
* {{Bishonen}}: [[CastFullOfPrettyBoys They're everywhere]]! But Zelman in particular, Kotaro even calls him pretty. Stop it [[YaoiFangirl fangirls]], Kotaro's ten.
** [[spoiler: Actually he is a very old female vampire, he just forgot, he needs some lecithin for his memory troubles. ]]
** [[spoiler:A ''reincarnated'' very old female vampire. I don't think medication will help.]]
* BodySnatcher, PeoplePuppets variety: The Kowloon vampire known as Man-Walker does this.
* BrainwashedAndCrazy: Those that end up bitten by Kowloons. [[spoiler: And there no way to bring them back once it happens. The only course is death.]]
* BrokenMasquerade: Temporarily. See TheUnmasquedWorld below.
* CannotCrossRunningWater: Some vampires, including Jiro, have this weakness.
* CueTheSun: Inverted; it's not the sun, but the rain.
* CurseThatCures: Chan was made a vampire using Kelly Wong's blood to save her life at her mother's request.
* DaywalkingVampire: Kotaru is able to walk around in sunlight with no ill effects at all, while his brother Jiro smoulders if he doesn't have an umbrella and sunglasses.
* DeadpanSnarker: Jiro has some pretty good ones: "Are you intoxicated or just insane?"
* {{Determinator}}: Jiro in the final episode. [[spoiler: When all hope seems lost, as it begins to rain down water like the flood, and the bad guys look like they might get away with a hitch, what does he do? he jumps off the top of the boat, takes two silver bullets to the chest, impales the driver of the boat and manages to crash the boat into a giant pillar.]]
* {{Expy}}: Zelman Clock looks a LOT like Heat from Bust-a-Groove. Both characters have an affinity for fire as well. Whether or not this is intentional I don't know, but if it isn't, it's one hell of a coincidence.
** Jiro is '''clearly''' based on [[Manga/{{Hellsing}} Alucard]].
* FaceDoodling: Cassa offers Mimiko the chance to do this to her brother. When Mimiko turns her down, she puts the marker in VictoriasSecretCompartment.
* FailureKnight: Poor Jiro.
* FoeRomanceSubtext: Cassa and Mimiko, episode 10.
* Creator/FUNimation: Did the English dub.
* GambitPileup: Okay, more like five. Hey, there are only twelve episodes.
* GlowingEyesOfDoom: The mind-controlling "Eye Raid" technique causes this for both the user and the victim. Zelman Clock's "[[KillItWithFire Eye Ignite]]" also makes his eyes glow, though with all the [[PlayingWithFire fire]] it's hard to see.
* GogglesDoNothing: Although Jiro occasionally uses his as sunglasses, Kotaro's do nothing but hang around his neck.
* GunsAreWorthless: Guns are pretty much useless against the sword-wielding Jiro. Not so much against other characters, though.
* TheImmodestOrgasm: The typical result of [[KissOfTheVampire being bitten]] by a vampire.
* ImpaledWithExtremePrejudice: Man-Walker's puppet body, by the Pile-Killer (and how he got his name: he impales vampires with piles, you know, gigantic wooden stakes).
* KatanasAreJustBetter: Partially justified, as the show ''is'' set in Japan. Jiro used is trained in using one, even doing so in the Hong Kong Crusade (technically a tachi, if we're not using katana as a generic term for Japanese terms instead of the specific term). Only three swords show up in the series, and two are katana.
* KissOfTheVampire: One of the minor characters claims that "[[BetterThanSex sex pales in comparison]]" to being bitten.
* MadeOfIron: Jiro, by Vampire standards. One of his weaknesses is water, and in the first episode he ends up falling into the ocean and ''walking'' to shore. In broad daylight, even.
* MagicPants: Cain must wear some, because they're the only part of his outfit to survive [[spoiler:his transformation into a wolf-man.]]
* NiceHat: Jiro wears one, though it often falls off during fights.
** He manages to hold onto to it pretty well in the first episode when he's diving into the ocean. If you watch you can see he has one hand on his head, holding it on, before he jumps.
** Let's not forget Zelman's hat, which never actually comes off.
* NobleDemon: Zelman Clock, the AffablyEvil lord of the [[ObviouslyEvil House of Darkness]] and [[CardCarryingVillain self-proclaimed "bad guy".]] Makes friends with Kotaro pretty much the first time they meet, and is one of the most powerful vampires alive helping to suppress the [[ZombieApocalypse wave of Kowloon Child infection.]]
* NoodleIncident: Jiro killed the Kowloon King. We're never told how, but it clearly wasn't a fair fight because Jiro admits that he wouldn't be able to do it again.
* OurVampiresAreDifferent: Sort of. Different bloodlines have different strengths and weaknesses, but all have at least some of both. Also, only the Kowloon bloodline can turn humans by biting them; other lines only turn humans when the humans in question drink their blood. Furthermore, being bitten is depicted as [[KissOfTheVampire extremely pleasurable]].
** The Kowloon are also dangerous to normal vampires, as being bitten brings them under their control, as we're unfortunately shown in the third episode.
* OutOfTheInferno: Zelman Clock, a pyrokinetic.
* PlayingWithFire: Ditto on Zelman Clock.
* PluckyGirl: Thy name is Mimiko.
* PstandardPsychicPstance: [[PlayingWithATrope Played with]]; Jiro's "Hide Hand" telekinesis usually involves him pointing at whatever he wants to move...with his middle finger.
* RapunzelHair: Cassa has this.
* RedBaron: In spades. Almost every combatant has a nickname: Silver Blade, Red-Eyed Butcher, Blue Wolf, Pile-Killer, Man-Walker.
** Although, this could be partially [[JustifiedTrope justified]], as most of the individuals are vampires, and have doubtless been around for a long, ''long'' time. For all we know, they collect them like Literature/{{Discworld}} vampires. They're also almost all survivors of the Hong Kong Crusade, so their nicknames may have started out as code names.
** Cassa is called the Black Snake.
* RedEyesTakeWarning: the only character with red eyes can [[KillItWithFire control fire.]]
* RedOniBlueOni: A strange case with Caine and Jiro, Caine is normally rather irritable and loud, but he's calm and cold under pressure. Jiro is snarky and relaxed, but freaks the hell out when his brother is in danger. If they switch roles when under stress, that just might make the Purple Oni.
* RingRingCRUNCH: Jiro cuts Mimiko's alarm clock in half because he can't figure out how to turn it off. As Kotaro says, he's "not good with modern technology."
* ShapeshiftingExcludesClothing: Vampires that get staked usually leave behind a small pile of dust and a pile of clothing.
* SingleStrokeBattle: [[spoiler:Jiro vs. Auguste, take two.]]
* SpannerInTheWorks: Zelman Clock. Right in the GambitPileup, too.
* TheMasquerade: See below.
* TheUnmasquedWorld: The Kowloon Shock and ensuing Hong Kong Crusade broke TheMasquerade, but the government convinced the populace that the vampires were all exterminated in the Crusade.
* ThrowingYourSwordAlwaysWorks: It does when you have telekinesis and superhuman strength, although Jiro was shown taking very careful aim first, and he threw it like a spear, not a knife.
* TwelveEpisodeAnime
* VictoriasSecretCompartment: Cassa seems to keep a marker there, for FaceDoodling purposes.
* ViewersAreGeniuses: Absolutely nothing important is explained directly, only a minor bit of backstory. They might be expecting viewers to have already read the light novels.
* VoluntaryShapeshifting: [[spoiler:Cassandra Jill Warlock.]]
* WeaksauceWeakness: Jiro has the usual vampire weaknesses but is especially averse to water (Not just Holy, any type of water), which drains him greatly [[spoiler:Doesn't help him in the final battle, as not only is it on a speeding motorboat but it starts to rain too. He manages to pull through.]])
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