->''In the final battle with Aizen [[ForWantOfANail a different choice is made]], and now Ichigo and his greatest enemy have [[PeggySue gone back to the beginning]]. His best friends are powerless, his allies don't know him, and everything he loves is in danger.''

''[[http://www.fanfiction.net/s/6437275/1/Hogyoku_ex_Machina Hogyoku Ex Machina]]'' is a completed ''Manga/{{Bleach}}'' fanfiction by [[http://www.fanfiction.net/u/230982/Mac_Ceallach Mac Ceallach]].

In the final battle, Ichigo and Aizen strike fatal blows against each other at the same time. The Hogyoku reacts by sending them both [[TimeTravel back three months]] to the point in time when Aizen first picked up the stone right after he betrayed Soul Society. On one hand, Ichigo has the chance to kill Aizen properly and [[SetRightWhatOnceWentWrong undo damage and deaths caused the first time around]]. Unfortunately, the enemy, too, is well-aware of what has (and will) happen, as well as who they should attack if they want to hurt Ichigo in the worst way.

It's different from most other PeggySue stories in that both TheHero and the BigBad get sent back in time, leaving both sides on a level playing field. Ichigo also wastes no time in explaining to everyone that time travel is going on, forgoing any masquerade or working behind the scenes.

Comes highly recommended on the [[{{FanficRecs/Bleach}} Recommendation page]].

The sequel, ''[[http://www.fanfiction.net/s/9424156/1/Further-Machinations Further Machinations]]'', is now up, as of June 24, 2013.

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!!This fanfic provides examples of:
* [[spoiler:[[AllAmazonsWantHercules All Zanpakuto Want Ichigo]]: Ichigo succeeds in convincing Muramasa to stand down. He did not expect Muramasa to choose him as his next wielder.]]
* AnthropomorphicPersonification: Neither Zangetsu nor his Inner Hollow were ever separate spirits from Ichigo -- they are ultimately a part of him, and only merged together with Ichigo is their master whole. [[spoiler:This technicality means that Ichigo was still capable of taking on a Zanpakuto, which is why Muramasa was able to bond with him.]]
* ArmorPiercingQuestion: Ishida asks it when Ichigo tells him he is already planning to kill Aizen instead of letting the Shinigami fight the war
--> ""Kurosaki. When did this become some kind of grudge match between you two?!"
* ArsonMurderAndJaywalking: [[spoiler: "Consorting with a declared threat to the peace! Offering to free a dangerous criminal! Releasing hundreds of Menos Grande into Soul Society! ''Merging with a second zanpakuto!''"]]
* AntiVillain: Starrk, Lilynette, [[spoiler:[[HeelFaceTurn Nel]]]].
* AppliedPhlebotinum: The crystals that create holograms.
* BadassInDistress: [[spoiler: Ichigo ends up in this position, despite also being a GodModeSue]].
* BigDamnHeroes: [[spoiler:Because Muramasa isn't a zanpakuto formed from Ichigo's soul, Aizen isn't able to drain him into the King's Key's creation right away. Thus, Ichigo is able to call upon Muramasa before Aizen can kill them both.]]
** Also, [[spoiler:Uryu, Isshin, Renji, Chad, Neliel and others arriving to save Ichigo from the hollowfied Tousen.]]
* BlatantLies: Zangetsu tells Renji that Ichigo is practicing how to [[LiteralSplitPersonality split himself up]] to make training in other areas easier. This is a brazen lie, as they have entirely different reasons to do this and it will actually make the training harder. Ichigo is rather disturbed that his ''sword'' is a much better liar than he is.
* BrickJoke: Zangetsu and the hollow frequently complain in one of the anime's omake that Ichigo's mindscape rains when he's depressed and that it has no animals, particularly purebreed dogs. [[spoiler:The form the spirit of the Hogyoku takes after Ichigo removes it from its body? A Labrador puppy.]]
* BroughtDownToNormal: Due to events near the beginning of the fic, Orihime loses access to her [[TheMedic Shun]] [[BarrierWarrior Shun]] [[WindsOfDestinyChange Rikka]] abilities, and it's said that it will take at least several months before she returns to her full power. According to the author's notes, this was done partially to serve as a DramaPreservingHandicap: "I wanted to take away Tite Kubo's little get-out-of-death-free card."
* CasualDangerDialogue: Ichigo, his hollow and Yamamoto discuss whether or not it's possible to [[spoiler:bind two zapakuto to a shinigami at once.]] All while [[spoiler: Tensa Zangetsu and Muramasa]] try to kill each other about 20 feet away.
* CelibateHero[=/=]ChasteHero[=/=]CluelessChickMagnet: Ichigo as usual and lampshaded mercilessly. In fact, his obliviousness to when people are interested in him [[spoiler:indirectly leads to Aizen's defeat]].
* ChekhovsGunman: [[spoiler: Muramasa. Without him, [[TheBadGuyWins Aizen's plans would have succeeded]]. You really don't expect a filler character to carry so much weight]].
* ChronicHeroSyndrome: Ichigo as usual. While thankful for it, it irks Yamamoto and Soi Fon to no end.
** KnightErrant
* CockFight: Hilarious, non-romantic example between [[spoiler:Tensa Zangetsu and Muramasa]].
* ComedicSociopathy: As usual, Mayuri and the hollow dish it out with aplomb.
* CrazyJealousGuy: Non-romantic example. When [[spoiler:Muramasa decides that Ichigo should be his next wielder, [[TheStoic Zangetsu]] does NOT [[NotSoStoic take it well]].]]
* CynicalMentor: Yamamoto acts as one to Ichigo by discussing battle strategies and forcing him to use his hollow abilities when he's been too frightened of them so far. He finds Ichigo far too idealistic, but as he put it, "In one thousand years, no shinigami has been born who was able to stand against the full force of my spiritual pressure." Guess who the exception was.
* DeadpanSnarker: Ichigo's hollow. See DoesThisRemindYouOfAnything below.
* DefeatMeansFriendship: Lampshaded when Ishida asks, "Kurosaki, is there anyone you've fought that you ''haven't'' become best friends with?"
* DeusExMachina: See the title.
* DisguisedHostageGambit: Right after traveling back, [[spoiler: Aizen switches appearances with Ichigo, leading everyone to attack the wrong person]].
* DoesThisRemindYouOfAnything: The hollow has fun with [[spoiler:Muramasa's unwanted intrusion into Ichigo's soul.]]
-->'''Hollow:''' You'd think [[spoiler:Muramasa]] had raped your soul or something.\\
'''Ichigo:''' What?\\
'''Hollow:''' You didn't want it, did you?\\
'''Ichigo:''' No, but- don't say it like that!\\
'''Hollow:''' Ah. [[BlatantLies Sorry.]] [[HurricaneOfEuphemisms Penetrated, then. Penetrated deeply. Without permission. Into virgin territory. There was thrusting involved.]] Am I doing any better now?
* TheDreaded: The RunningGag with everyone being terrified of Unohana continues as even Ichigo's [[SuperpoweredEvilSide hollow self]] is frightened of her. [[http://lizeth.deviantart.com/art/HeM-sketch-193460959#/d376jfj There's even a fanart of it]].
* DroppedABridgeOnHim: Subverted. Aizen effortlessly slaughters several Shinigami when he and Ichigo return to the past, [[spoiler: but they're all revealed to have just received a TapOnTheHead from Ichigo once Aizen's illusion drops.]] The author even defies this trope in the following chapter's notes: "If I kill [Yoruichi], [[DyingMomentOfAwesome it'll be way more epic than that]]. [[{{Badass}} She's awesome]]."
* [[spoiler:EarnYourHappyEnding: For Shakushi, the spirit of Kenpachi's zanpakuto. Kenpachi even promises to be a bit more responsible with him!]]
* EnemyMine: Yoruichi is surprised upon finding out that the Vizards fought alongside them against Aizen in the original timeline, since they have no reason to like them. Ishida suggests it was because of this trope.
* EveryoneHasStandards: Nearly everyone is sickened with the thought of another Tousen (enough to agree with the less-than-popular Gin), [[spoiler:and nearly everyone was enraged by Kouga's mistreatment of Muramasa, whether they showed it or not.]]
* FantasticRacism: After learning that the Vizards that had been cast out a century ago were still alive and not crazy, the Gotei 13 members decide to actively avert this by asking if they want to come back with no strings attached, [[spoiler: offering the two empty captain positions to them]], and make plans to appoint a less racist Central 46 this time around.
* FinalSpeech: Ultimately subverted since having the main character die in the third chapter would be a problem, but everyone gets the feeling that this is going on when Ichigo asks Chad to take care of his sisters and he has a hard time getting people to take him seriously about an actual threat and that he's not just becoming delusional. Ichigo references this trope at the time as well.
* {{Foreshadowing}}: It's easy to miss, but an author's note helpfully points it out. While TheCavalry is fighting [[MasterOfIllusion Aizen]], [[spoiler:Ichigo, gravely injured, sensibly stays out of the way. [[TheHero That]] [[LeeroyJenkins sounds]] [[HotBlooded like]] [[{{Determinator}} him]], [[SarcasmMode doesn't it?]] It foreshadows that Aizen wasted no time in implementing his DisguisedHostageGambit]].
* ForWantOfANail: [[spoiler:Ichigo does not use the Final Getsuga Tensho release against Aizen in the FinalBattle. Another example of this is that Senna from the first film never exists since Ichigo spends all his time in Soul Society and she is never created]].
* FridgeHorror: In-universe example when Ishida and Ichigo explain TB and antibiotics to Unohana. Unohana suddenly has OhCrap moment when she realises that if Ukitake had TB, she'd been unintentionally strengthening the disease.
* FridgeLogic: "I guess antibiotics don't work on dead guys then."
* GhostShipping: The hollow just can't get enough of [[spoiler:Neliel.]]
* GoodNewsBadNews:
-->'''Ichigo:''' I have good news and bad news. The good news is that you got your powers back.
-->''*Ishida looks hopeful*''
-->'''Ichigo:''' The bad news is, you never told me how.
-->''*Ishida looks pissed*''
* HandsomeLech: Ichigo's hollow highly endorses ladies having physical relations with Ichigo.
* HaveWeMetYet: Most of the Gotei 13 are thrown by how familiar the random human invader is with them.
* [[spoiler:HeelFaceTurn: Muramasa and because she was restored to her rank, Nel.]]
* {{Hologram}}: Using specially formed crystals, Mayuri created a device that allows people to project memories of theirs as holograms. It's main purpose is to not have the audience sit through Ichigo constantly explaining the plot to everyone else.
* [[spoiler:[[IHaveYourWife I Have Your Family and Best Friend]]]]
* InLoveWithYourCarnage: When everyone sees Ichigo's memories of Tatsuki, which are mostly of her fighting, Kenpachi is impressed and declares that she will be welcome in Squad 11 when she dies and becomes a Shinigami.
* ItCanThink: While it's touched on in canon, in ''Hogykou ex Machina,'' the Hogyoku has the mind of a domesticated animal. [[spoiler:Its spirit is turned into a dog by the end of the story.]]
* IWantMyJetPack: Orihime excitedly asks if there are robots in the future. Since it's only been three months, no, there are no robots.
* IWarnedYou: When Ishida's warns Mayuri (not very hard, mind you) that it wouldn't be a good idea to have Ichigo attempt to place his reiatsu into a rare and valuable crystal because he's clumsy, Mayuri blows him off. Then Ichigo (having a ''massive'' amount of reiatsu and no control over it, hence “clumsy”) makes the crystal explode.
-->'''Mayuri:''' DO YOU KNOW HOW MUCH THAT ''COST?''
-->'''Ishida:''' I told you so.
* InsistentTerminology: “It's Hitsugaya-taicho.”
** Hilariously, the one time Ichigo calls him Hitsugaya-taicho, [[{{Irony}} Hitsugaya-taicho immediately wishes to be "Toshiro" again]].
* {{Irony}}: When Ichigo hears that Hitsugaya hung out with his sister, he says, [[KnightTemplarBigBrother “He dies.”]] When it's pointed out that Hitsugaya probably didn't reciprocate any possible feelings of affection, he replies, “He'd [[PrecisionFStrike fucking]] better not have! He's at least ten times her age!”
-->'''Hitsugaya:''' He wants to kill me because I'm too ''old?'' (''There was just something [[ChildProdigy cosmically unfair]] about that.'')
* IShouldWriteABookAboutThis: Orihime points out that Ichigo's adventures would make a great manga. They could even have it printed in ''ShonenJump''.
* JerkassHasAPoint: Tensa Zangetsu thinks that Ichigo should keep his different selves separate so as to continue getting stronger despite having trouble controlling what he's got and already being able to cut down mountains. The hollow self claims that at some point trying to gain even more power just gets silly. Ichigo finds himself agreeing with the [[{{Jerkass}} jerkass]] SuperpoweredEvilSide.
* KarmaHoudini: Gin. Justified by the fact that Ichigo simply wasn't around when he committed his worst crimes and couldn't mention them.
** Though to be fair, Ichigo's intervention also prevents those crimes from ever happening.
* KnightTemplarBigBrother: Upon learning that Karin had a crush on Toshiro, Ichigo's first thought is to kill him. After Zangetsu talks him down from that, Ichigo asks him if he can at least maim him. When denied that, he reaffirms that he ''will'' kick his ass.
* LeaningOnTheFourthWall: "We could serialize them, maybe! ShonenJump would take the manga!"
* LiteralSplitPersonality: Of a sort when Ichigo figures out how to manifest [[EmpathicWeapon Zangetsu]] and his [[SuperpoweredEvilSide hollow self]] in the real world. The latter and [[BloodKnight Zaraki]] end up getting along swimmingly.
* LoopholeAbuse: In this fanfic, ain't no rules say a kido-user can't serve in the Eleventh Division. Yumichika is surprised.
** [[spoiler:Muramasa claims this when he bonds with Ichigo as a zanpakuto. He and Tensa Zangetsu disagree but Muramasa simply refuses to go away.]]
* MamaBear: [[spoiler:Neliel to Yuzu and Karin.]] Unfortunately, before she can act on it, she learns just how outclassed she is by [[spoiler:Ulquiorra]] and thus has to stand down.
* MentalTimeTravel: Because of how the two of them gained their powers, Ichigo keeps all of his power-ups while Aizen ends up back at square one. This has advantages and disadvantages for both of them.
* MistakenForPedophile: The characters mistake Hollow Ichigo's attraction to Nel for this. They're relieved when they learn about Nel's adult form.
* MrFanservice: The Shinigami Women's Association will NOT let Ichigo get a haircut for this reason and they take great pains to keep it that way.
* MySisterIsOffLimits: When Ichigo discovers that Karin held an interest in Toshiro, he decides that he's going to kill Toshiro, as [[Really700YearsOld he's at least ten times her age.]] Toshiro, who along with the rest of the Gotei 13 is watching Ichigo via a surveillance device, is [[OhCrap less than enthusiastic]] about the idea.
* NobleDemon: See SparedByTheAdaptation, [[spoiler:though Ulquiorra is a big maybe. He decides to escort Neliel and the twins not just because he's curious how he died in the original timeline but also to keep Nnoitra from hassling any of them]].
* ObliviousToLove: And Admiration, Ichigo again. [[spoiler:This is why Muramasa manages to blindside him.]]
* OhCrap: When everyone is watching [[spoiler:Ichigo talk Muramasa down from his ideas about his future rebellion]], they figure he has a plan. When [[spoiler:Ichigo gets stabbed by Muramasa]], they realize that actually no, there isn't one.
* OnlyMostlyDead: Unohana calls Ichigo this after the first fight with Aizen.
* OriginalFlavor: Pretty much everyone behaves the way one would expect.
* PapaWolf: Zangetsu is very protective of Ichigo and [[CrazyJealousGuy his position as Ichigo's zanpakuto.]]
* PassThePopcorn: Several characters watching parts of Ichigo's life via [[AppliedPhlebotinum projections of his memories]] (which they had permission for) and with hidden security cameras (...which they did not). At one gathering, they comment on how entertaining his life is, some bring popcorn and Coke (Rukia told them it was a tradition), and everyone, even [[StoicSpectacles Ishida]] and [[GrumpyOldMan Yamamoto]], ends up treating it like a movie night.
* PeggySue: In the final battle, Aizen and Ichigo kill each other simultaneously. The Hogyoku then makes them snap back to the point in time when Aizen first touched the Hogyoku three months ago. They both quickly take advantage of the new circumstances.
* PhysicalGod: The full implications of Ichigo's ascension after fusing with Zangetsu are explored. Bleeding out, half-dead, he cuts through ''Yamamoto's Bankai'' like so much tissue paper.
** And you know how powerful soul reapers have a heavy spiritual pressure? Ichigo's is like the sky: It's there, it's beyond immense, but you can't actually feel it, [[ShownTheirWork just like Aizen described when he first saw this form]]. This actually works against Ichigo when he needs to be healed; since the healer can't sense his reiatsu, they can't do anything.
* PoisonousPerson: The author added this effect to Ichigo's PhysicalGod form to give him a weakness; basically anyone who touches Ichigo's bare skin while he's in this form gets severely burned, which makes sense given what we know about spiritual pressure if the individual in question were indescribably powerful.
* PowerTrio: Zangetsu is TheSpock, Ichigo is TheKirk and the hollow and Tensa Zangetsu are TheMcCoy.
* PrecisionFStrike: After being told his plan will ultimately not work, Gin's eyes are [[EyesAlwaysShut wide open]] and he says, "Well....shit."
* RedEyesTakeWarning: [[spoiler:Shakushi. Also a ScaryBlackMan, literally.]]
** MeaningfulName: [[spoiler:"Red Death."]]
* RetGone: [[spoiler:Senna, to a greater extent than in her movie. [[ForWantOfANail Since Ichigo spent all of his time after Rukia's rescue in Soul Society, she never forms in the first place]]. [[RippleEffectProofMemory He doesn't even remember her]] until the AppliedPhlebotinum shows it]].
* RunningGag: The various shinigami and visored commenting on how weird it is that Ichigo knows the future.
-->'''Renji:'''"… that's gonna be creepy for a while, isn't it?"
** People wanting to stab Ichigo with something.
-->''"People keep stabbing me. It's not as easy to survive as I make it look."''
* SelectiveObliviousness: One could make a case for Ichigo since his hollow, who's a part of him, never fails to point out his ChickMagnet status.
* SetRightWhatOnceWentWrong: [[spoiler: Several characters are saved from dying the second time around and most if not all of the conflicts outside of Aizen's rebellion are worked around with diplomacy or other similar planning]].
* ShoutOut: Ishida is able to [[TaughtByTelevision rile off several treatments for tuberculosis because of an episode of]] ''Series/{{House}}'' he saw.
** Orihime says Ichigo's adventures could be printed in ''ShonenJump''.
** Isshin gets one to ''Film/ThePrincessBride''. [[MyNameIsInigoMontoya Take a wild]] [[YouKilledMyFather guess on]] [[PrepareToDie what it is.]]
*** Unohana gets one too. When she notices that Ichigo is OnlyMostlyDead, she notes that this means he is slightly alive.
* ShownTheirWork: In a way. The author planned on having Ishida and Ichigo explain what was going on with Ukitake's illness, but first asked her high school readers if they knew several random facts presented about tuberculosis (''without'' running to Wikipedia) to be sure the characters would reasonably know.
* SpannerInTheWorks: [[spoiler:When Aizen decides to make the King's Key out of Ichigo instead of Karakura Town, he doesn't realize Ichigo now has another zanpakuto. [[BigDamnHeroes Muramasa to the rescue!!]]]]
* SparedByTheAdaptation: Gin[[spoiler:, Muramasa, Ulquiorra, Starrk, Lilynette]].
* StatingTheSimpleSolution: Nnoitra gets annoyed by Aizen's complex plans and EvilGloating and wishes he would just kill the good guys and get it over with.
-->'''Nnoitra''': "We should've just killed the human as soon as Aizen-sama knew he was alive. This setup is bullshit."
* StraightManAndWiseGuy: Ichigo and his interactions with the hollow are HILARIOUS and must be read to be believed.
* SurveillanceAsThePlotDemands: The Captains use security cameras to keep an eye on Ichigo (and to keep updated with the plot). Unohana is particularly disturbed when she finds out Mayuri had them installed long before Ichigo even showed up.
* SuspiciouslySpecificDenial: When presented with the AppliedPhlebotinum.
-->'''Ishida:''' Would it modify Ichigo's memories in any way?
-->'''[[MadScientist Mayuri]]:''' It is perfectly safe! Only the first test subjects went insane!
-->'''Ichigo:''' Um…
* TapOnTheHead: During the DisguisedHostageGambit, most of TheCavalry gets knocked out before any damage is inflicted on themselves or the hostage. It failed to work on Kyoraku and was deemed as not even worth attempting on Yamamoto.
* TaughtByTelevision: See ShoutOut above.
* TimeTravelTenseTrouble:
-->'''Ichigo:''' Hinamori? They were pretty close, right?
-->'''Matsumoto:''' Were?
-->'''Ichigo:''' Are. Sorry. She got… will get better.
* TooDumbToLive[=/=]AssholeVictim: Oh, ''Yammy.''
* {{Troll}}: Since Ichigo's Hollow can't fight Ichigo anymore, this becomes his main form of entertainment.
* TrustPassword: Yamamoto gives Ichigo one of these for when Rukia will be RetGone d in the future (i.e. the third film). [[spoiler: It also ends up being useful for identification against Aizen's illusions, though Ichigo almost gets killed then anyway since the password is a name and he has trouble remembering it.]]
** Ichigo convinces Gin that he's from the future by explaining the true power of Gin's bankai, which Gin never revealed to anyone.
* TheUnreveal: [[spoiler: When Shinji decides to finally use his Bankai, Aizen knocks him out cold before he can even say, "Bankai".]]
* UnskilledButStrong: Ukitake breaks it down.
-->Ichigo's bankai was not the most powerful. It was not even the fastest. What it was, however, was the ''easiest to use''. Ichigo had attained it and fought a captain with decades of experience an hour later, and had been able to do so because it needed no special abilities or skills beyond the fighting techniques he was already familiar with.... who was permanently in Shikai release, who compensated for the lack of decades of practice by using his Bankai as though it were his Shikai, who used his mask as though it were his Bankai, and who had still further means to increase his fighting ability.
* VillainsActHeroesReact: Ichigo lampshades this by pointing out that Aizen has learned to use it to his advantage.
--> "This isn't right. This is what he wants. Us distracted. Always reacting to what he does."
* ViolenceIsTheOnlyOption: Oddly for [[{{Shounen}} the genre]], most of things that are [[SetRightWhatOnceWentWrong set right]] are done by talking to people. Telling people that their rebellion will fail and/or offering an olive branch has surprisingly good results. Notably, this did not work on [[spoiler: Tousen]].
* WakingNonSequitur: Subverted; [[TheMedic Unohana]] thinks this is happening when Ichigo wakes up after a two day coma and, when asked about his previous fight, answers with "Aizen… [[OneWingedAngel turned into a butterfly]]." [[EmpathicWeapon Zangetsu]] has to inform her that it actually happened.
* [[spoiler: WoundThatWillNotHeal: The power of Shakushi, Kenpachi's sword. The effect can be deactivated.]]
* YouAreNotAlone: In the end, the greatest difference between Aizen and Ichigo is that Ichigo '''chose''' not to be alone. [[spoiler:That is what ultimately leads to Aizen's death.]]
* YouHaveGotToBeKiddingMe: Kenpachi laughs and says this when Ichigo's memory of Aizen turning into a butterfly is shown.
* YouNeedToGetLaid: Ichigo gets told this word-for-word by his [[SuperpoweredEvilSide hollow self]] since he's severely weakening himself in order to not be a PoisonousPerson (it came with his PhysicalGod status) and he's a ChickMagnet anyway, so why waste it? [[ChasteHero Ichigo's so embarrassed and adverse to the idea]] that the hollow turns to Zangetsu and asks, "He's not gay, right? I'd know if he was gay."
* YourEyesCanDeceiveYou: Ichigo trains blindfolded, both to improve his ability to sense reiatsu and so he can fight Aizen without falling prey to his illusions.