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A Creator/KaoriYuki manga set in a dark Victorianesque world, the series centers around a young earl, Cain Hargreaves. Cain is seventeen, apparently orphaned, rich and eccentric. Unfortunately, his family past will allow him no peace.

Everybody in Cain's family, we are told, has a habit of studying poisons, and Cain is no different. With the aid of his trusted manservant Riff, he uses his knowledge of poisons to seek justice for murder victims, usually by poisoning the murderer. Both halves of the series (see below) begin with murder mystery short stories that Cain investigates before launching in to longer storylines concerning issues close to Cain himself.

Like any good [[CrimeAndPunishmentSeries Crime and Punishment series]], ''Count Cain'' brings up just about every kink under the sun. It has [[ElegantGothicLolita gothic sensibilities]], as well as [[HollywoodScience bad steampunk science]]. AbusiveParents, [[BrotherSisterIncest Incest]], and {{Magnificent Bastard}}s are a staple. Blood, death, tragedy, and madness also abound.

The series was originally split into two halves, as the creator took a break to work on another series, ''AngelSanctuary.'' The first part consists of four arcs collected in five volumes, entitled ''Count Cain''. The second, done some years later, is eight volumes long and entitled ''Godchild''.

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!!Provides Examples Of:

* AndIMustScream: Rebecca's dolls
* AntiHero
* ArchnemesisDad: Alexis to Cain.
* AristocratsAreEvil: Crehador certainly thinks so, but for the most part averted, with a few exceptions.
* ArrangedMarriage
* ArtEvolution: The art has changed a ''lot'' from the first volume to the fifth; then Kaori Yuki took a break from ''Cain'' to work on ''AngelSanctuary'', and when she took up ''Cain'' again, the art style was almost completely different from where she'd left off. The mangaka herself even makes note of this in one of the sidebars in ''Godchild''.
* AuthorAppeal: BrotherSisterIncest, HoYay, FoeYay...
* AxCrazy: Several characters.
* BabiesEverAfter: [[spoiler:In the epilogue, Oscar and Mary Weather are expecting a child.]]
* {{Badass}}: Cain.
** BadassAndChildDuo: Cain and Mary Weather.
** BadassInANiceSuit: It is set in Victorian England after all.
** CulturedBadass
* BastardBastard: Jizabel, born out of wedlock, is a primary antagonist and indeed quite a bastard.
* BattleButler: Riff, [[spoiler:subverted when he has his FaceHeelTurn]].
* BeautyEqualsGoodness: Subverted in "Scold's Bridle".
* BestServedCold
* [[spoiler:BiggerBad: Augusta]]
* BigBrotherInstinct: Cain towards Mary Weather.
** Dudley towards Eliza.
** Completely averted with Jizabel. He wants to kill both Cain and Mary Weather.
* BigScrewedUpFamily: Like you wouldn't believe. The only one who gets off lightly is Merryweather, [[spoiler:and that's because she turns out to not really be Alexis' daughter after all]].
* BittersweetEnding
* {{Brainwashed}}
* {{Brainwashed And Crazy}}
* BreakTheCutie: [[spoiler:Jizabel's backstory.]]
* BrokenBird: Mikaela ...Well, when she's not in her {{Yandere}} mode.
* BrotherSisterIncest: Between [[spoiler:Alexis and Augusta]].
* CainAndAbel: Ironically enough, Cain is the Abel [[spoiler:to his illegitimate and completely psychopathic half brother, Jizabel]].
* CartwrightCurse
* TheChessmaster: Alexis
* ChildByRape: Cain was born from Alexis's rape of his own sister, Augusta. [[spoiler:Later revealed that it was the other way around, and that Augusta seduced Alexis.]]
* ChronicHeroSyndrome: While Cain may be aloof, he genuinely wants to help people and is very upset whenever he can't save someone.
* CreepyChild: Emile and Rebecca. Mikaela formerly. Cain was pretty creepy when he was younger, too.
* DarkAndTroubledPast: Many characters, although Cain and Jizabel in particular.
* DarkChick: Mikaila
* DeadlyDoctor: Jizabel.
* DefrostingIceQueen: Emmeline, to a certain extent.
* DiedInYourArmsTonight: [[RuleOfThree Three times]] in the climax-- [[spoiler: Jizabel and Cassian, Alexis and Ida, and Cain and Riff.]]
* DisguisedInDrag: Jizabel during his childhood, Cain in one chapter, and also [[spoiler:Leroy]].
* DisposableWoman
* DistressedDamsel: Most of the sympathetic female characters end up like this at one point.
* DoomedAppointment: [[spoiler:Neil in "Zigeunerweisen"]].
* DrivenToSuicide: Augusta throws herself out of a window when Cain comes to visit her, his resemblance to Alexis triggering memories of her rape at his hands. [[spoiler:After Augusta is revealed as the villain, she admits she did this to further drive a wedge between father and son.]]
* DysfunctionJunction: Most of the cast.
* EeriePaleSkinnedBrunette: Cain
* ElegantGothicLolita: Mary Weather, plus half the female characters Cain encounters.
* EvilCannotComprehendGood: Jizabel doesn't understand the relationship between Cain and Riff.
* FaceHeelTurn: [[spoiler:Riff]]
* FightingFromTheInside: [[spoiler:Riff, after his evil SplitPersonality takes over.]]
* FreudianExcuse: Averted. Cain would have some justification in invoking it, but he never does. Also averted with Jizabel; the excuse isn't so much "excuse" as it is the actual base of Jizabel's plot. His abuse isn't just a past event to spur revenge, but an actual plot point for the story and an ongoing point of development.
* GenderBlenderName: Apparently, Kaori Yuki thinks the names Cassandra, Jizabel and Gloria are unisex.
** Coming from the other direction, Meriwether (or Merryweather) is traditionally a boy's name.
* GoodScarsEvilScars: Cain's scars are easily hidden; the villain in "Scold's Bridle" has hers on her face and wears a mask to hide them.
* HairOfGoldHeartOfGold: Mary Weather.
* HeelFaceTurn: [[spoiler:Riff, among others]].
* HollywoodScience
* IAteWhat: [[spoiler:When Jizabel was a child, he owned a pet lamb that he spent a lot of time with. Alexis secretly had the lamb killed and served to Jizabel for dinner one day, promising him that he would be able to go see the lamb if he finished his meal. When Jizabel was nearly done, Alexis revealed what he had done with "I let you see him, didn't I? Did you enjoy Snark, Jizabel?"]]
* IfICantHaveYou: Mikaela threatens Cain this way a few times, and [[spoiler: Cain himself decides to kill Riff after his SplitPersonality-driven FaceHeelTurn because "you belong only to me".]]
* IHaveYouNowMyPretty: Cassandra to Leroy. And arguably, Jizabel.
* IWantMyBelovedToBeHappy: Subverted with Cain [[spoiler:and Riff]].
* InTheBlood: There's a lot of discussion (and {{Angst}}) about to what extent Cain is or is not "cursed" by his bloodline, as well as whether or not Merry will be able to escape it. [[spoiler: The latter issue is sidestepped when she turns out not to be his sister by blood.]]
* InformedDeformity: [[spoiler:Viola]] in "Scold's Bridle" [[spoiler:wears a mask to hide her horrible scars, which turn out to be mild acid burns on an otherwise pretty face. But then, she ''is'' completely insane...]]
* IronicNurseryTune: Many of the earlier cases are themed around a Mother Goose rhyme, and [[spoiler: the entire series]] closes with "bids you all adieu" from ''Simple Simon''.
* TheJeeves: Riff, [[spoiler:but subverted when it's revealed that he is even more mentally unstable than Cain]].
* JesusTaboo
* KillEmAll: Nearly all the minor characters introduced end up dead.
* KnifeThrowingAct: Cassian was sold to the circus and performed in one of these for some time. During the series, his main weapon remains throwing knives.
* LightFeminineAndDarkFeminine: Maryweather is the Light to Mikaela's Dark.
* LivingDollCollector: [[EvilCripple Rebecca]] in "The Little Crooked House".
* LivingEmotionalCrutch: Riff for Cain, somewhat. [[spoiler: After he is swallowed up by his SplitPersonality, Cain goes the rest of the way off the deep end and is significantly more reckless for the entire rest of the series. [[TearJerker He also cries for the first time since he was a child.]]]]
* LoadsAndLoadsOfCharacters: Aside from the main cast, we have new characters introduced nearly every chapter. Though they don't stay long.
* LondonTown: Where The Streets Are Paved With Excrement version. It ''is'' Victoriana, after all.
* LostHimInACardGame: Jizabel bets HIMSELF over to Cassandra if Cassandra can manage to get rid of Cain. (Perhaps a moot bet as it's not like anyone would have stopped Cassandra from taking him anyway.)
* LostInTranslation: Merryweather =/= Mary Weather, primrose = prom rose, Baraba company =/= Barabba company named after the thief, Rukia =/= Lukia.
* LoveHurts
* LoveMartyr: Mary Weather, in "The Little Crooked House".
* MadLove: All over the place in a familial sense, but [[{{Yandere}} Mikaela]]'s love for Cain takes the cake.
* MadScientist: Jizabel
* ManChild: Gilford
* ManchurianAgent
* ManipulativeBastard: Cain, along with others.
* MasterPoisoner: Cain is very knowledgeable in, and collects, poisons.
* {{Meganekko}}: Marjorie
* MercyKill: Cain performs one on [[spoiler: Madeleine Russell]] when she [[DrivenToSuicide asks him to.]]
* MySisterIsOffLimits: Cain does not approve of Oscar marrying Mary Weather.
* NaiveEverygirl: Mary Weather.
* {{Not Brainwashed}}
* NamesToRunAwayFromReallyFast: Cain, although as a subversion because he is not a villain. He is an anti-hero, but it's not Cain that innocent bystanders have to worry about, it's getting in the way of the people who are after Cain.
* [[spoiler:NotBloodSiblings: Cain and Mary Weather]]
* OjouRinglets: Plenty.
* OlderThanTheyLook: [[spoiler:Cassian]]
* OnlySixFaces: Particularly in run of Count Cain, most obviously when it came to young boys who all looked exactly the same. More or less avoided after the ArtEvolution.
* PaperThinDisguise: Invoked and then subverted, twice in ''Godchild''. Cain doesn't seem to realize that he really should disguise himself more properly before walking into enemy base... Just what made him think it would be okay to just [[ClarkKenting wear glasses]] after his blonde wig attempt had failed so much earlier?
* PetTheDog: Jizabel loves animals. And Cassian.
* PimpedOutDress: Every single one.
* PluckyComicRelief: Oscar. Oh Oscar...
* PrettyInMink: At least in some of the art, Mary Weather wears [[PimpedOutCape a short cape]] with white fur.
* PsychoSerum
* RagsToRoyalty: Mary Weather grew up on the streets before Cain took her in.
* RapeAndRevenge: [[spoiler:Quite a real possibility for Jizabel to Cassandra.]]
* RapeAsDrama: Alexis on Augusta is the most prominent case. [[spoiler:Turns out it wasn't really rape and the victim actually planned and provoked it herself for her own sick purposes]].
* RapunzelHair: Almost all the female characters, and also Jizabel.
* RedemptionEqualsDeath: Mikaila.
* RoyallyScrewedUp: ''Many'' characters.
* RoyalsWhoActuallyDoSomething: More like nobility. But Cain is not idle. He always solves the murders he comes across and has resolved to take down Delilah.
* RuleOfThree: The finale features three instances of a character dying in another's arms-- [[spoiler: Jizabel held by Cassian, Alexis held by Ida/The Moon, and Cain held by Riff-- the last being set apart by the fact that it was Riff who was dying, and Cain [[TogetherInDeath decided to stay with him]]]].
* ScaryShinyGlasses: Jizabel.
* ShownTheirWork: Kaori Yuki likes to point out that she often has done the research...and jettisoned it in favor of a more interesting development which might otherwise be prevented.
* SomethingCompletelyDifferent: An early chapter called Double inexplicably takes place in modern America, and has nothing to do with any of the recurring characters or plotlines.
** "Double" is an early short story of Kaori Yuki. I don't know how it is in Japan, but at least in Germany it's rather normal to feature additional and unrelated shorts in single volumes of serial manga... so, no, it's really not "Count Cain". (granted, kaori Yuki manga get this treatment extremely often due to the ton of one-chapter stories she has written.)
* TheSouthpaw: Riff is left-handed. [[spoiler: But only his good personality is; his right hand was put out of commission for long enough by his suicide attempt around the time of the switch that he had to learn to use his left.]]
* SpellMyNameWithAnS: Jizabel/Jezebel/Jezabel, Lukia/Rukia/Lucia, Merriweather/Merrywether/Mary Weather....
* SplitPersonality: [[spoiler: Riff.]]
** SplitPersonalityTakeover: [[spoiler: Unusually, it's the "created" personality that's the ''good'' one, and eventually manages to take over entirely.]]
* SuperpoweredEvilSide: [[spoiler: Riff]] is perfectly competent and pretty strong to begin with, but once the SplitPersonality takes over, people's heads start getting crushed.
* StuffedIntoTheFridge
* TarotMotifs: Delilah. Used incorrectly at some points, and correctly in others.
* TheUnfavorite: Jizabel feels he is this and it is much of the reason why he hates Cain.
* ThereAreNoTherapists: Justified: Because, literally, it's Victorian London. Do you have any idea what mental health "care" was like then?
* TogetherInDeath: [[spoiler:Riff and Cain]].
* TrackingDevice: Verging on TrackingChip, [[spoiler: Cain's earring, though the good Riff never needed to use it.]]
* TrueCompanions: Cain and Oscar border on VitrolicBestBuds, but they're still always there for each other.
* UsedToBeASweetKid: [[spoiler:Jizabel]]
* WeCanRuleTogether: [[spoiler:Alexis to Cain]].
* WhiteHairBlackHeart: Jizabel.
* WhyCouldntYouBeDifferent
* WigDressAccent: Cain in a chapter of ''Godchild'', minus the accent. He doesn't speak since, well, despite being beautiful like a woman, he sounds very much like a man. His disguise is really convincing, and nobody suspects a thing. [[spoiler:It's already too late when Mayor Gloria realizes [[OhCrap who that woman truly was]]]].
* WithGreatPowerComesGreatInsanity
* WifeHusbandry: [[spoiler:Oscar and Merryweather]].
* YaoiGuys: Riff and Cain.
* {{Yandere}}: Mikaela. Anyone who got between her and Cain would meet a horrible death.
* YouAreWorthHell: Frequently discussed by Cain and Riff, as Cain repeatedly claims he's damned and Riff promises to follow him to hell. [[spoiler: The final nail in the coffin for Riff's FaceHeelTurn is when he tells Cain that he can go to hell alone.]]
* [[spoiler:YoungestChildWins: Mary Weather is the only one to survive and she becomes head of the Hargreaves family. She also has the least amount of horrible things happen to her.]]
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