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''What are the Blade Children?''

''Spiral: Suiri no Kizuna'' (Bonds of Reasoning) is the story of this mystery, into which Narumi Ayumu is drawn after an apparently attempted suicide at his school. The girl involved was a member of this mysterious group, a group that Ayumu's older brother, Kiyotaka, was investigating at the time of his disappearance two years earlier. So, against the wishes of Narumi Madoka (Kiyotaka's wife, and current detective), Ayumu begins his own investigation, assisted by the school's lone member of the newspaper club, Yuizaki Hiyono.

At first, Ayumu is simply challenged outright by the Blade Children, who claim to know something of the whereabouts of his older brother. Their "tests" are primarily tests of Ayumu's mental prowess and cunning, but occasionally test his luck as well (the Magic Squares/Bomb puzzle, for instance). As he begins to gain their trust, the mystery of "What are the Blade Children?" is supplanted by "Why are the Hunters trying to kill the Blade Children?" as the Blade Children's ostensible leader, Eyes Rutherford, is targeted by an assassin.

The Blade Children themselves are fairly normal, if prodigies can be called normal, and are physically identifiable as different only by their cat-slit eyes and a single rib missing from their ribcage.

Unfortunately, the anime ends without reaching the answers it set out to find, due to the fact that it caught up with the manga on which it was based. (The fourteenth and final volume of the manga was released in September of 2005, the anime aired between 2002 and 2003.) The final arc of the anime deals with a similar concept as volumes six through eight of the manga, but takes place under different circumstances.

The manga was followed up by the [[{{Prequel}} prequel]], ''Spiral: Alive'', about to end Monthly Shounen Gangan. ''Alive'' stars three new characters: GenkiGirl Sekiguchi Imari, reluctant serial killer Amanae Yukine, and Sawamura Shirou, a boy who wants to be a detective just like Kiyotaka. Oh, and they're also in a LoveTriangle. (Insert MurderTheHypotenuse joke here.) While these three are the central characters, old favorites such as Ryoko, Rio and Kousuke are still central to the plot, and most others have at least made cameos.

''Spiral'' is not to be confused with the manga ''{{Uzumaki}}'', which means "spiral", or the ''[[TheRing Ring]]'' sequel ''Rasen'', which ALSO means "spiral". [[RunningGag While we're at it]], don't confuse the two with certain terms from ''{{Naruto}}'', or with [[TengenToppaGurrenLagann Spiral Energy]].
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This program provides examples of:

* AdaptationDecay
* AdultsAreUseless
* AffablyEvil (Kanone in the anime)
* AGodAmI (Yaiba vs. Kiyotaka, Hizumi vs. Ayumu)
* AncientConspiracy
* BackFromTheDead ([[spoiler: Amanae]] in ''Alive'')
* BadassBookworm (Eyes, Rio)
* LittleMissBadass
* BigBad
* {{Bishonen}}
* BlindWithoutEm (the cause of the attempted suicide[[spoiler:In the manga, the cause of an actual murder]])
* BrotherSisterIncest (Variations)
* BunnyEarsLawyer (Kanone: fighting god, lover of kitties. Even worse is Kiyotaka in ''Alive'': his idea of a disguise is a cartoony frog suit. Which he wears while riding a bicycle. Despite it not having eye holes.)
* {{Chessmaster}} (By the middle of the Kanone arc in the manga, everyone is pretty much convinced that Kiyotaka is God.)
* CompositeCharacter (Sayoko Shiranagatani originally wasn't part of the BlindWithoutEm incident, but the anime co-opted her from the locked room mystery story to simplify things and create a better segue between them.)
* CrowningMomentOfAwesome (Rio's introduction set off, like, a whole string of these.)
* LittleMissSnarker (Rio again)
* DeathCourse (The Excellent Hotel)
* DidWeJustHaveTeaWithCthulhu (Kanone and Eyes have tea together after the latter gets out of hospital because the former almost killed him AGAIN. Then again they're ''both'' quite cheerful about it.)
* DoomedAppointment
* FriendlyEnemy (Ayumu and Hizumi)
* Foreshadowing (Hiyono is about to say the name of Kanone's father when he interrupts her. [[spoiler: And then there's the fact she knows it at all. No, it's not just her insane info-collecting skills.]])
* GeckoEnding
* GeniusBruiser (Kousuke, Ryoko)
* GetOutOfJailFreeCard
* GreatDetective
* HairColors
* IdiotHero (Subverted. Ayumu's lounging on the roof, ditching class. He must be just like every other stupid shounen protagonist, right? Wrong.)
* InactionSequence (more of an ending alteration)
* InvisibleToNormals (no huge explosions, but the Blade Children and Hunters are not common knowledge, and their activities are covered up regularly)
* KilledOffForReal (Manga only: [[spoiler:Kanone]])
* LivingWithTheVillain (Ayumu and Hizumi again. Also Ayumu/Hiyono, Rio/Ryoko/Kousuke, and Kanone to a lesser extent: all go to the same school.)
* LockedRoomMystery
* LockingMacGyverInTheStoreCupboard (partly subverted, as Ayumu blocks the lock before entering the room)
* MagicalDatabase
* MagnificentBastard (See 'Chessmaster.')
* {{Meitantei}}
* MercyLead
* TheMinnesotaFats (Kiyotaka is better than Ayumu at everything, even though he has disappeared)
* MoralityPet (Rio and Ryoko for Eyes and Kousuke; some mild inversion in that ''being'' one also softens up Rio's own character.)
* NamesToKnowInAnime (KotonoMitsuishi, voice of Madoka)
* NeutralFemale (Hiyono: though she's usually out of her depth mentally, she does occasionally subvert this by aiding Ayumu)
* NoGuyWantsAnAmazon (Kousuke claims this is his opinion of Ryoko. In ''Alive,'' she wonders why it's [[SchoolgirlLesbians only girls]] asking her out, and her classmates explain all the boys in town are afraid of her and the "Takamachi Ryoko Legend." Which is, basically, a bunch of over-exaggerations of things she actually has done.)
* OrdinaryHighSchoolStudent
* ParentalAbandonment (Ayumu, whose parents are both gone, and who lives with his brother's wife, in a rare case of "Sibling Abandonment")
* PetTheDog (Kousuke and Eyes, only with cats. And Rio.)
* PowerTrio (Kousuke as Id, Rio as Superego, Eyes as Ego. In ''Alive,'' Kousuke as Id, Ryoko as Superego, Rio as Ego.)
* {{Prequel}} (''Spiral: Alive'')
* SlapSlapKiss
* TearJerker (Subjective, but there are lots of them, especially by the last three books of the manga (Kanone and Hizumi are good at these). Also Charlotte's backstory in ''Alive''.)
* ThoseTwoGuys (Imari's two friends in ''Alive'')
* TimeBomb (the Magic Squares/Bomb puzzle. Also the Blade Children themselves, in a way.)
* [[spoiler:TwinSwitch (Amanae Yukine & Charlotte]] in ''Alive''. [[spoiler:Even though they're not actually related as far as we know. Scanlations, please.]])
* UnspokenPlanGuarantee (Manga: Kanone arc. ''Repeatedly.'')
* TheWatson (Hiyono or Kousuke, usually)
* XanatosGambit (The major appeal of the series is watching Ayumu, the [=BlaChil=] and later, the Hunters, attempt to outsmart and kill each other.)
* XanatosRoulette (Everything from the [=BlaChil=] meeting Ayumu to [[spoiler:Kiyotaka stealing his crush]] was planned by Kiyotaka, and it gets steadily more convoluted as the story passes, especially in the manga.)
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