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''Psychic Detective Yakumo'' (or in Japanese ''Shinrei Tantei Yakumo'', or 心霊探偵八雲 ) is a series of novels by Manabu Kaminaga. The series has been running since 2004 and spans fifteen volumes as of December 2017 (ten belong to the main series, four to side-stories, and one to Yakumo's youth).

One day, college student Haruka Ozawa's friend Miki goes on a test of courage with a friend at a building said to be haunted. Suddenly she loses consciousness for no apparent reason, and must be admitted to the hospital. Due to the suspicious circumstances, Haruka decides to enlist the help of the cynical, sarcastic Yakumo Saitou, a supposed psychic. After realizing he's a fraud when it comes to having psychic abilities, he reveals that he can see ghosts, and will assist her. During the investigation, they get attacked, and it turns out his left eye is red, and that this is the eye with which he can see ghosts.

The series has spawned two completed manga series: one by Miyako Ritsu, subtitled ''Akai Hitomi wa Shitteiru'' (''The Red Eye Has a Clue''), and the other by Oda Suzuka, who is the character designer for the {{anime}} as well. It has also inspired a live-action drama, a stage play, and a ThirteenEpisodeAnime series by Creator/BeeTrain which aired on NHK in Fall 2010. Manabu Kaminaga has also written a prequel spin-off called ''Ukikumo Shinrei Kitan -- Sekigan no Kotowari'' (or, in English, ''Strange Talk of Psychic Ukikumo -- Truth of the Red Eye'') set in the Edo period.
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!!''Psychic Detective Yakumo'' provides examples of:

* AbusiveParents: The most obvious case is [[spoiler:Yakumo]]'s mother, who attempted to strangle him when he was younger. This turns out to be a bit more complicated.
** In volume six of the novel series, it is revealed that [[spoiler:Yakumo's father has also been DeadAllAlong, his ghost trying to drag Yakumo down to his own level of despair so he can take over his body]]. This is also true in the Suzuka manga.
** In the anime, [[spoiler:Nao]] used to have a twin brother. His [[spoiler:red eyes]] reminded their mother of his father ([[spoiler:her rapist]]), which made her panic and [[spoiler:drop the newborn baby]].
* AdaptationDistillation: Plot elements of the manga arcs had been shortened or cut out to fit the ThirteenEpisodeAnime [[AnimatedAdaptation adaption]], and some character roles have been changed or added in to avoid plot holes. For example, Tatsuya is a co-worker of Haruka's instead of an acquaintance she met at Miki's party. Both the Ritsu manga and the anime only cover the beginning of the series. The Sazuka manga does cut out and change a few things from the novel, to despite otherwise following it closely.
* AdaptationDyeJob: In both manga adaptations and the novels, Haruka has [[CurtainsMatchTheWindow matching brown hair and eyes]]. In the anime adaptation, she has pink hair and [[PurpleEyes light purple eyes]]. Her hairstyle also varies between adaptations.
** [[spoiler:Yakumo's father]] has silver hair in the anime.
** Most of the characters are given [[YouGottaHaveBlueHair otherworldly hair colours]] in the anime, including, purple, green, and pink.
* AdultsAreUseless: In the anime, Haruka's mother seems strangely fine with sending her daughter into what could be a dangerous situation and barely puts up a fight to talk her daughter out of it. This isn't true in the novel, where she insists on coming along.
* AmateurSleuth: Yakumo, obviously.
* AngstySurvivingTwin: Haruka blames herself for the death of her twin sister, Ayaka, when they were seven. Yakumo helps her get over it in during the first case, but she still suffers from this to a lesser extent, and only much later in the story has she begun to move forward.
* AnimalMotifs: Yakumo is compared to a cat especially when he's sleeping (and a caterpillar when he's in his sleeping bag). Gotou is often compared to a bear, especially by Yakumo.
* AnAstralProjectionNotAGhost: In the anime, in the midst of all the actual ghosts, one apparent ghost turns out to be the projected spirit of a terminally ill but still-living girl, whose anxiety about her impending death causes her to project her spirit to other people at night while she's sleeping.
* ArmorPiercingSlap: Haruka delivers one to [[spoiler:Tatsuya]] in the Ritsu manga when it's clear that, in spite of being the culprit for an accidental hit-and-run murder, he's only considered for his own welfare, triggering Haruka's memories of her late sister.
* AwesomeByAnalysis: Yakumo is by far the most [[HyperAwareness observant and perceptive]] character in the series. What is still more impressive is the way he puts things together, sometimes reaching SherlockScan heights.
* BadassBookworm: Although not a bookworm, Yakumo is apparently very well-read and does not appear physically imposing, but he is actually both moderately strong and good a figuring out what needs to be done in a crisis.
* BadassInDistress: During the "Connected Feelings" case, Yakumo is held captive by [[spoiler:his DeadAllAlong father]], and is saved by [[spoiler:Haruka's arrival and his mother's ghost]].
* {{Bishounen}}: [[TallDarkAndHandsome Yakumo,]] also a good number of the other male college students who pop up.
* BookDumb: For a detective, Gotou is ''far'' from well-read. For example, a discussion about adipocere has him asking "who is this Eddy Poser guy you keep talking about?!"
* BreakTheCutie: This is what happened to [[spoiler:Yakumo's mother]], who was revealed to have been kidnapped by [[spoiler:the man with two red eyes]] and was raped and impregnated by him. It is also implied that this was taken further leading to [[spoiler:her attempted murder of Yakumo]]. Multiple antagonists attempt to do this to [[spoiler:Haruka]] in order to "break" Yakumo, sometimes they are more direct about breaking Yakumo.
* BrilliantButLazy: Considering the amount of time the guy spends asleep and cutting classes, you'd never think that Yakumo is a deductive genius.
* BrokenBird: Yakumo fits this to a T (see DarkAndTroubledPast).
* BrutalHonesty: Yakumo never sugar-coats anything, which usually ends up being reassuring rather than infuriating (probably because he knows when to shut up, among other things). A certain middle-school principal, on the other hand...
** Haruka tends just to say what ever she thinks, while it sometimes gets her into trouble, it is usually harmless, and on occasion it is even beneficial (for Yakumo, at least).
* CaptainObvious: In the anime, [[spoiler: Doctor Sakakibara]], upon seeing Haruka and Detective Gotou, runs away from them. They had never met him before, but Gotou chases him anyway.
* ChildByRape: [[spoiler: Saitou Yakumo]] is this.
* CoolShades: The mysterious [[spoiler:red-eyed]] man (and, in the anime, his female accomplice) always sport these and frequently practices SunglassesAtNight.
* TheCoroner: Hata is a necrophile, but an otherwise good coroner (this is lampshaded in the novels and in the Sazuka manga).
* CreepyChild: The ghost of the boy from The Dark Tunnel arc.
* CurtainsMatchTheWindow: Yakumo, when he has his contact lens on. Haruka in both mangas and in the novels, but not the anime.
* CuteMute: Nao.
* TheCynic: This is one of Yakumo's defining characteristics.
* DamselInDistress: Haruka is an ordinary person, so when being attacked by murderers and the like, she tends not to fair very well. This is justified by [[spoiler:the red-eyed man]] designating her as a target to get at Yakumo and downplayed by her sometimes figuring that it would not be a good idea to provoke her captors or by being drugged. At other times, Haruka manages to be a DefiantCaptive, or even a DamselOutOfDistress, by misleading her violent captors and provoking them.
* DarkAndTroubledPast: In the very first chapter, Yakumo reveals that his own mother tried to kill him when he was younger. As the series progresses, further details are described, including that [[spoiler:he's a ChildByRape and that his almost-step-father was murdered by his biological father]], among other things. To make things worse, most people [[FreakinessShame are terrified, disgusted, or show pity or a strong aversion if they see his left eye.]] Not to mention [[BlessedWithSuck all the fun of always seeing the dead.]]
* DeadAllAlong: This ultimately is the case for several characters, including [[spoiler: Yakumo's parents and his biological father]].
* DeadpanSnarker: Yakumo is constantly being TallDarkAndSnarky without any change of expression [[OOCIsSeriousBusiness (when he isn't, something is up).]] Haruka and Gotou periodically manage to send a barb or two his way, mostly Haruka.
* DefrostingIceKing: Thanks to Haruka, Yakumo starts to open up in his snarky, stoic way. This is lampshaded by Isshin in both manga series and Gotou in the novel and the Sazuka manga.
* DisappearedDad / MissingMom: These seem to be very common in the Saitou family (partially a case of [[spoiler: DeceasedParentsAreTheBest]], with [[ArchnemesisDad one exception]]). There is also a case where a child's father became abusive after his wife walked out on them.
* EarlyInstallmentWeirdness: In the first volume of the novel and in the beginning of the Ritsu manga, ghosts have a more direct effect on the world and Yakumo can [[PsychicPowers show people what ghosts look like]]; both of these characteristics disappear afterword.
* EyesAlwaysShut: In the Ritsu manga, Yakumo's uncle never is drawn with his eyes open.
* FamilyEyeResemblance: Turns out that [[spoiler:the ghost-seeing red eye]] is a family trait. This is part of TheReveal, and is also a plot point in a spin-off, ''Ukikumo Shinrei Kitan''.
* FireForgedFriends: Yakumo and Gotou use each other for the common goal of solving cases. Yakumo uses the information Gotou possesses as a police detective, while Gotou uses Yakumo for his ability to see the dead.
* FirstNameBasis: In the novel and both manga versions, Yakumo tells Haruka to call him by his first name so it would less of a hassle. In the anime, she starts calling him "Yakumo-kun" on her own, much to Yakumo's initial chagrin.
* FreakinessShame: When Haruka discovers Yakumo's red eye after he wounded from an attack, Yakumo tells her she must be disgusted (in the Ritsu version) or thinks that she would scream (Suzuka version). Instead, Haruka is the complete opposite and reassures him of it. She even thinks it's "pretty." In the novel, she sees it and says it's beautiful before Yakumo has a chance to comment, not that he doesn't refer to her as strange for this reason afterword.
* FriendOnTheForce: Gotou and Ishii. Hata to a lesser extent.
* GeniusSweetTooth: This is lampshaded in the Oda Suzuka series, where after interrogating the ghost possessing Miki, Yakumo needs to rest a while. It cuts to him eating ice cream at a cafe, with his excuse being that after "being forced to use his head", he needs sugar. Another extra in the same also plays on this.
* GratuitousEnglish: This is restricted to the anime. A bit in the opening song. Not to mention Nanase Miyuki's singing a whole verse of London Bridge is Falling Down.
* GreenEyedMonster: In the anime, Haruka was a little saddened to see Yakumo with another girl in the second episode, but as it turns out, the girl was the client who had asked him to investigate the episode's ghost.
* HeartwarmingOrphan: [[spoiler:Nao]].
* HeIsNotMyBoyfriend: Yakumo and Haruka are often mistaken for a couple, which always has Yakumo providing a rude rebuttal of this kind or simply insisting otherwise. In the novel (as well as the Ritsu manga and in the anime), early in their acquaintance, Yakumo jokes that Haruka has bad taste considering Tatsuya, which disgusts Haruka, ilicting this response.
* HeroicBSOD: Haruka goes through one of these when she finds out that [[spoiler:Shiori is dead]]. Later on, Yakumo goes through one when [[spoiler:Isshin is murdered in order to "break" him]].
* HeroicSelfDeprecation: Yakumo and Haruka both have bouts of this. In the novel and in the Suzuka manga adaptation, Yakumo feels frustrated that he can not help others and can only "see" using his red eye. In the Ritsu manga adaptation, Haruka feels she can not help others in spite of so many people helping her. Gotou shows symptoms of this, even though with regard to a case which is unrelated to him, Hata tells him this makes him unsuited for being an officer.
* HollywoodFire: The first episode of the anime.
* JacobMarleyApparel: This is a constant throughout the series in all of its incarnations. Somewhat justified by the ghosts typically being in the same condition that they died in, as well as Yakumo's theory that ghosts are clumps of emotions (since most people in the first world aren't nudists).
* JapanesePronouns: In the novels' main series, as a university student, Yakumo refers to himself as "boku." The "Secret Files: Kizuna" volume has Yakumo referring to himself as "ore" during middle school, which was generally [[CharacterDevelopment much less polite than how he currently refers to himself university]].
* JerkWithAHeartOfGold: In the novels and both manga series, Yakumo tries to hide it, but he really is a kind person when you come down to it. This results in him being so contrary that in the beginning of the third novel, he is referred to as "Japanís representative for contrariness." That said, he comes off more as a {{Jerkass}} in the anime.
* INeverSaidItWasPoison: This happens in the Locked Room case, although differently depending on the adaptation. In the novels and both manga, an accident is claimed to be suicide without any proof. In the anime, [[spoiler:Takaoka-sensei]] asks who murdered someone who is missing. In both cases, it is a big tip off.
* ItsAllAboutMe: Tatsuya. According to Yakumo, he's inconsiderate for always only thinking of himself and what solely affects him. And if anything doesn't go his way, [[SelectiveObliviousness he'll just laugh it off]]. As it turns out, Yakumo is ''completely right''.
* [[ItsPersonal It's Personal]]: For Haruka in the Message From the Dead arc when her friend Shiori [[spoiler:is killed.]]
* IntergenerationalFriendship: Between Gotou and Yakumo, no matter what the people in question say.
* InvisibleToNormals: The aforementioned dead people.
* ISeeDeadPeople: The English title is actually something a misnomer to Yakumo: he isn't psychic, he has the ''physical'' ability to see ghosts.[[note]] The Japanese title uses the word "''shinrei''" which specifically refers to seeing disembodied souls.[[/note]] Not only can he see them, he can [[TalkingToTheDead communicate with them]] and [[EarlyInstallmentWeirdness can show an image of them to others (only in the Locked Room case).]]
* {{Kimodameshi}}: The first case, the Locked Room, happens because of one of these.
* TheKlutz: Ishii, on top of being bumbling and believing in the occult, to point where you'd think he'd trip over a pea.
* KnightInSourArmor: Yakumo is one of these. He's always got a rude, sarcastic remark for everyone, but he still assists the police department in solving murder mysteries. Not to mention requests from the dead or people he cares for, although he complains the whole way.
* LighterAndSofter: The anime takes plots from the other three versions, but nevertheless some of the twists in the anime are much more lighter compared to its counterparts.
* LikeFatherUnlikeSon: [[spoiler: Aside from the red eye and seeing ghosts, Yakumo's personality is the polar opposite of his biological father]], and this is lampshaded by the "son."
* LimitedWardrobe: Only in the anime! Come on, a female college student who wears the same outfit everyday? At least she finally changed in the last anime episode [[spoiler:for Isshin's funeral.]] Everyone did, actually.
* LoveAtFirstSight: In the Suzuka manga version and anime adaptation, Ishii sure seems a bit smitten with Haruka. In the former, he even thought she was an angel.
* LukeIAmYourFather: Oddly zigzagged. It turns out that [[spoiler:the red-eyed man]] is [[spoiler:Yakumo]]'s father, the latter [[YouAreNotMyFather refuses to acknowledge it]] as a ChildByRape.
* MagicEye: Yakumo has one normal black eye, and one red eye that can see ghosts. He wears a contact lens to cover it, though.
* MakeItLookLikeAnAccident: This happens in all three of the cases in volume one of the novel, as well as their adaptations in anime and manga, only replace "accident" with "suicide." In the Locked Room case, it was not so much making it look like anything as simply claiming it to be so. In the Dark Tunnel case, this was played straight by differing people depending on the adaptation, by avoiding an accident looking like it had been caused by them. Finally, this is the crux of the [[spoiler: Message From the Dead]] case, the BigBad pulled this twice, first by making [[spoiler:her husband]]'s poisoning look like illness, and later in order to [[FakingTheDead fake her death]].
* MeaningfulName: Mentioned in the novel, the Ritsu manga adaptation, and the anime, Yakumo roughly means "multilayered clouds."[[note]] Yakumo literally means "eight clouds" (八雲), thus thick or multilayered.[[/note]]
* {{Megane}} / {{Meganekko}}: Although there are some minor characters who also qualify, the most important one is Ishii.
* MementoMacGuffin: Seemingly the red gemmed necklace that Yakumo always hold onto. It belonged to his mother. He later lets Haruka hold onto it.
* MistakenForGay: Yakumo hilariously convinces Gotou that Ishii has a thing for him. Ishii doesn't; he just loves the occult and thought Gotou was a psychic detective instead of Yakumo. [[spoiler: Ishii actually is infatuated with Haruka]].
* MysteriousProtector: In the anime, [[spoiler:Shunsuke Takeda]] seems to be one for Yakumo and Haruka.
* NaiveEverygirl: Haruka is an older, more mature version, who doesn't have body image or tormentors to worry about. However, in all adaptions, she is overly trusting of people she hardly knows and is less difficult to convince when she has no moral objections (there she is strong). Also, Haruka is shown to be very conscious of her face without makeup.
* NotSoDifferent: Yakumo and Haruka. See HeroicSelfDeprecation.
* NotWhatItLooksLike: After Haruka goes to Yakumo's place to consult him on seeing a ghost in her apartment, he starts taking off his shirt to change into a warmer one. Gatou happens to pick that time to drop in on Yakumo to ask him about a case. Subverted in that Gato ''knows'' it's not what it looks like and is simply the ShipperOnDeck for Haruka and Yakumo.
* OddFriendship: Age aside, the athletic and dramatic Gotou and the lazy and stoic Yakumo have an odd yet solid friendship. As an energetic idealist, Haruka also seems like an odd match with Yakumo (possibly also a case of OppositesAttract, depending on the ultimate state of their ShipTease).
* OneHeadTaller: Yakumo is this in comparison to Haruka.
* ParanormalInvestigation: Well, it ''is'' about a guy who can see ''ghosts''... That said, in the series, ghosts can't directly cause physical phenomena (they can do plenty indirectly, however).
* ParentalAbandonment: [[spoiler:After attempting to strangle him]], Yakumo's mother [[MissingMom disappeared;]] we don't know [[DisappearedDad what happened to his father.]] In the anime, his father [[spoiler:turns out to be the silver haired antagonist that's been trying to provoke Yakumo, and his mother is revealed to have been DeadAllAlong]]. Meanwhile, in the novel and in the Sazuka manga, it turns out that [[spoiler:both of his parents and his biological father]] are all revealed to have been DeadAllAlong, the former two, due to the latter's machinations.
* ParentalSubstitute: Yakumo's uncle, Saitou Isshin, this would cross into HappilyAdopted territory, if Yakumo would allow it.
* PetTheDog: As Yakumo starts [[DefrostingIceKing defrosting]], he slowly becomes less mean to Haruka.
* PsychopathicManchild: [[spoiler:Tatsuya]] shows elements of this.
* RedEyesTakeWarning: Subverted for Yakumo, whose left eye is red and allows him to see ghosts. Also subverted for Isshin, Yakumo's uncle, wears a red contact lens to match Yakumo's left eye in order to understand him a little more and share his burden. However, played straight with the mysterious man [[spoiler:who is revealed to be Yakumo's father]] (his appearance differs between adaptations).
* TheReveal: The red-eyed man turns out to be [[spoiler:[[ArchnemesisDad Yakumo's father]]]], and Shinsuke Takeda is [[spoiler:Yakumo's mother's fiancé]]. Then there's [[spoiler:Nanase Miyuki]], who hides behind multiple identities.
* SacrificialLamb: It varies between adaptations. In the novel and the Ritsu manga version--[[spoiler:Yuuichi and Shiori]], in the Suzuka version--[[spoiler:Kazuhiko]], and in the anime adaptation--[[spoiler:again, Yuuichi]]. In a way, it's easy to sympathize with Haruka, considering that all these people are [[spoiler:''her friends'']].
* SensitiveGuyAndManlyMan: Ishii and Gotou.
* ShipperOnDeck: Gotou is this in all versions for Haruka and Yakumo; in the novel and in the Sazuka manga, Shiori, Isshin, and Haruka's mother join in.
* ShipTease: This goes on with Yakumo and Haruka to almost WillTheyOrWontThey levels.
* ShoutOut: In the anime, a self ShoutOut in episode eight, Makoto holds a card with the words D-Station written on top (D-Station is a subdivision of Creator/BeeTrain the studio that animates the series, even the address is the same).
** Another takes place in episode twelve:
-->'''Silver Haired Antagonist:''' [[Film/ReturnOfTheJedi I can feel it, Yakumo ... Your strong hatred!]]
* ShrinesAndTemples: Seen from time to time since Yakumo's uncle is a Buddhist monk.
* SpiritAdvisor: Haruka's dead sister Ayaka is sort of one for Yakumo and Haruka (in all versions). In the novel and in the Ritsu manga adaptation, [[spoiler:Shiori]] is also one for Haruka.
* TheStoic: Yakumo usually has indifference plastered on to his face, even when he's being more expressive, which is lampshaded more than once. As he [[DefrostingIceKing opens up]], Yakumo shows a few cases of being NotSoStoic (usually in worry), as well as a few instances of being plain-old expressive.
* TeacherStudentRomance: In most versions of [[spoiler: the Locked Door]] case.
* TeethClenchedTeamwork: Yakumo and Gotou make it seem this way.
* TogetherInDeath: [[spoiler:Azusa and Shinsuke Takeda]].
* TrueCompanions: Gotou spends several moments of volume eight of the novel thinking about how he thinks of Haruka and Yakumo as family members (of sorts).
* {{Tsundere}}: Yakumo seems to be incapable of being honest about being close to people and thus ends up this way.
-->'''Yakumo:''' If I'm bored to death that day and have errands to run nearby, I might make an appearance [to your concert].
* TwoLinesNoWaiting: This happens a lot in the series, usually Haruka is somehow connected to some other occurrence, sometimes this is [[JustifiedTrope due to]] the machinations of the mysterious red-eyed man, other times, not so much.
* UnbelievableSourcePlot: The series has elements of this. Detective Gotou tends to keep the fact he's using a teenage boy who sees ghosts to help solve cases well under wraps. Yakumo himself, not so much, although in the beginning he does hide his ability to see ghosts... by using some tricks to make people think he's plain psychic to get some extra cash.
* UnfinishedBusiness: This is why ghosts are attached to the human world and cannot move on. They are left behind clumps of feelings, whether it's the desire to be avenged, to the desire to live, to have their bodies found and cared for, or genuine feelings for a living person.
* UnkemptBeauty: Yakumo has constant bedhead due to sloppiness, this does not interfere with him being TallDarkAndHandsome.
* VitriolicBestBuds: Gotou and Yakumo, type two. In the novel, [[spoiler:Gotou risks and eventually loses his job helping Yakumo escape when the latter is under suspicion of murder]].
* WhatHappenedToTheMouse: The anime does not show what happened to [[spoiler:Tatsuya]] in the end of third episode, but it can be assumed he'd been arrested for the hit-and-run, as in the other versions he appears in.
* WrongGenreSavvy: In the Ritsu adaptation and in the novels, Tatsuya thinks Yakumo dislikes him because he's [[GreenEyedMonster "close friends"]] [[SelectiveObliviousness with Haruka]]. Yakumo just ''doesn't'' like the guy, and every single thing Tatsuya does makes Yakumo's dislike deepen. Haruka doesn't like the guy either.
* YouWakeUpInARoom: When [[spoiler:Takaoka-sensei or Yuuichi (depending on the version)]] ''thinks'' he killed [[spoiler:Yuri]] after hitting her a little too hard, he hides her body in a basement. [[spoiler:Turns out she wasn't dead after all. Until she either suffocated or starved to death while trying to ''claw her way out'' of the room]].

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