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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 FUNimation

Not to be confused with BlackBlood, a trope about censoring blood, or ''TheBlackbloodAlliance'', a comic.
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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 exculsive, [[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 Cusade.
* 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.
* 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.
* 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, but that still doesn't explain why Jiro used one in the Hong Kong Crusade, much less what appears to be VictorianLondon. Only three swords show up in the series, and two are katana.
** Watch the flashback sequences at the beginning of each episode again. In one it shows Jiro introducing himself to Alice as Sub-Lieutenant Jiro Mochizuki of the Imperial '''''Japanese''''' Navy. Now, I don't know, but, being trained almost from birth to use a weapon is a pretty good reason to be using it a century later, in Hong Kong and The Special Zone. Oh and it's not a Katana, by the length and curvature is seems to be more of a [[http://en.wikipedia.org/wiki/Tachi Tachi]]
*** The word "katana" does not refer to just one type of sword; it also functions as a generic term for all Japanese swords, including straight ones. If you want to be specific, though, technically, the main difference between tachi and katana is that tachi are worn edge-down, usually hanging from the belt, and katana are worn edge-up, stuck through the belt. The other differences are more a function of time and changes in sword design coupled with the changing popularity of each style. Since Jiro 'carries'' his instead of either sticking it through his belt or hanging it from a frog (sword/scabbard holder) on his belt, the generic term "katana" is appropriate.
**** The above statement's mileage may vary depending on the profession (Or obsession) of the reader. Some may say that willing ignorance is not cool. Blade types have their specific names. The use of one type to refer to other types should not occur.
*** The English version, as translated by FUNimation, has no navy specified; the introduction is as follows:
-->Jiro: ''I'm Jiro Mochizuki, and I'm a Sub-Lieutenant Second Class in the navy.''
* 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.]]
** Now stop it. I know you fan girls want to see the man naked, but come on, he transformed only partially. He didn't shapeshift his legs, just his head and part of his upper body. The pants would have had to be pretty defective to malfunction when his legs didn't even change their volume.
* 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.
* PowerMakesYourHairGrow: When [[spoiler:Alice]] turns Jiro into a vampire, he instantly gets long hair as part of the power up package.
** He had a ponytail before that; he just started wearing it loose.
* 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: 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.
** Which means they switch roles when under stress. Does that make them each both parts?
** Two 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.
** Mostly because the anime is based off some light novels in Japan, which probably hold more information on the characters.
* 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.]])
* ZombieApocalypse: With vampires.
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