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

''[[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]]'', came out on June 24, 2013, but the author has made no updates to it since the first chapter.

!!This fanfic provides examples of:
* 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
-->'''Ishida Uryu:''' Kurosaki. When did this become some kind of grudge match between you two?!
* AntiVillain: Starrk, Lilynette, [[spoiler:[[HeelFaceTurn Nel]]]].
* AppliedPhlebotinum: The crystals that project holograms of the user's memories.
* BadassInDistress: [[spoiler: Ichigo ends up in this position, despite also being a GodModeSue]].
* BigDamnHeroes: [[spoiler:Muramasa]] saves Ichigo from Aizen's trap.
* BigWhat:
** When Hollow Ichigo invokes the YouNeedToGetLaid trope.
** Toshiro's reaction to Ichigo's KnightTemplarBigBrother attitude.
* 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]]. Meanwhile, [[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]] joining Ichigo becomes integral to the plot later on. Without his involvement, Aizen's plans would have [[TheBadGuyWins succeeded]].
* ChronicHeroSyndrome: Ichigo as usual. While thankful for it, it irks Yamamoto and Soi Fon to no end.
* 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 [[spoiler:next wielder]], [[TheStoic Zangetsu]] [[NotSoStoic doesn't 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 up to that point. He finds Ichigo far too idealistic, but is grooming Ichigo to eventually take over his position.
* DeadpanSnarker:
** Ichigo's hollow. See DoesThisRemindYouOfAnything below.
** Ishida has a moment when Ichigo breaks the first projection crystal and Mayuri exclaims over Ichigo's lack of control despite Ishida's warning.
--->'''Ishida Uryu:''' Sorry, did you think I was worried about him dropping it?
* DefeatMeansFriendship: Lampshaded when Ishida asks, "Kurosaki, is there anyone you've fought that you ''haven't'' become best friends with?"
* DiabolusExMachina: Just when the hero is about to defeat the villain, a magic rock saves the villain by sending both of them back in time, allowing the villain to get away and better prepare for next time.
* DisguisedHostageGambit: Right after traveling back, 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.\\
'''Kurosaki Ichigo:''' What?\\
'''Hollow:''' You didn't want it, did you?\\
'''Kurosaki 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, 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]]. She's awesome."
* EarnYourHappyEnding: After untold years of agony, Shakushi, the [[spoiler:spirit of Kenpachi's zanpakuto]], finally comes to an understanding with Kenpachi. Kenpachi even promises to be more responsible about the matter going forward.
* 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), and nearly everyone is enraged to see [[spoiler:Kouga's mistreatment of Muramasa]], whether they express 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, offering the empty captain positions to them, and making plans to appoint a less racist Central 46 this time around.
* FantasticRomance: Ichigo's inner hollow is fixated on Neliel, for some reason.
* 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: Ichigo does not use the Final Getsuga Tensho against Aizen in the canon FinalBattle, which leads to the Peggy Sue Diabolus ex Machina. From there, Ichigo gradually notices increasingly large changes as a result of him doing things differently the second time around.
* FridgeHorror: In-universe example when Ishida and Ichigo explain tuberculosis and antibiotics to Unohana. Unohana suddenly has an OhCrap moment when she realises that if Ukitake has TB, she's been unintentionally strengthening the disease with healing kido.
* GoodNewsBadNews: Ichigo has good news for Ishida: he got his powers back in the future. However, he also has bad news: Ishida never told him how it happened, so he can't provide Ishida with the information now.
* 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.
* HeelFaceTurn: [[spoiler:Muramasa]] and, because she was restored to her former rank, [[spoiler:Neliel]].
* {{Hologram}}: Using specially formed crystals, Mayuri created a device that allows people to project memories of theirs as holograms. Its main purpose is to not have the audience sit through Ichigo constantly explaining the plot to everyone else.
* IHaveYourWife: Aizen manages to capture Ichigo's family and forces Ichigo to comply with his plan by holding them hostage.
* ILikeThoseOdds: When Ichigo starts up a sparring session with Ikkaku, the latter is somewhat unwilling to fight since the former is wearing a blindfold as practice for fighting Aizen:
-->'''Madarame Ikkaku:''' Hmmm... you got guts, Ichigo. Even if you're blind I'm not gonna go easy on you. You sure you want to do this?\\
'''Kurosaki Ichigo:''' You don't think this is a good idea? ''[ponders]'' Yeah, you're right. This is really unequal.\\
'''Madarame Ikkaku:''' ''[surprised]'' Huh?\\
'''Kurosaki Ichigo:''' ''[smirking]'' Maybe if I tied one arm behind my back?\\
'''Madarame Ikkaku:''' Oh, you're going ''down,'' punk!
* 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 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.
-->'''Kurotsuchi Mayuri:''' DO YOU KNOW HOW MUCH THAT ''COST?''\\
'''Ishida Uryu:''' 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]].
* IShouldWriteABookAboutThis: Orihime points out that Ichigo's adventures would make a great manga. They could even have it printed in ''Magazine/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 the first time around and can't testify to them, and Ichigo's intervention prevents those crimes from ever happening the second time around.
* 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! ''Magazine/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 [[spoiler:bonds with Ichigo as a zanpakuto]]. He and Tensa Zangetsu disagree but [[spoiler: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 whereas 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 when they first see her in Ichigo's memories. They're very relieved when they learn about Nel's adult form, Neliel.
* MomentKiller: A tearful silence follows Ichigo's showing of Muramasa's life, ending with his AlasPoorVillain death. Then Gin speaks up:
-->'''Gin''': Intrigue, action, and a tragic ending. I give it four sta—\\
''[Matsumoto kicks him in the shin]''
* MrFanservice: The Shinigami Women's Association conspire and go to great lengths to prevent Ichigo from getting a haircut until they have enough pictures of his new look to fill their next calendar.
* MySisterIsOffLimits: When Ichigo discovers that Karin held an interest in Toshiro, he decides that he's going to kill Toshiro, who's [[Really700YearsOld at least ten times Karin's 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 snack on popcorn and soda while watching parts of Ichigo's life via [[AppliedPhlebotinum projections of his memories]] (which they have his permission for) and with hidden security cameras (which they do 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 canon final battle, Aizen and Ichigo kill each other simultaneously. The Hogyoku then sends them back in time to the moment when Aizen first touched the Hogyoku three months before. 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. Also, 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 describes in canon when he first sees 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 (even Yamamoto) 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, [[EyesAlwaysShut Gin's]] eyes go wide open and he says, "Well....shit."
** When Zangetsu attempts to calm down Ichigo by mentioning that Toushirou probably didn't reciprocate or even notice Karin's affection, Ichigo exclaims that, "He'd better fucking not have!"
* RedEyesTakeWarning: Shakushi is a very dangerous character with glowing red eyes.
* RetGone: 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]]. [[spoiler: He doesn't even remember her]] until the AppliedPhlebotinum reveals his [[RippleEffectProofMemory subconscious memories]] of the events surrounding her.
* RunningGag:
** The various shinigami and Visored commenting on how weird it is that Ichigo knows the future.
--->'''Abarai Renji:''' ...That's gonna be creepy for a while, isn't it?
** People wanting to stab Ichigo with something.
--->'''Kurosaki Ichigo:''' People keep stabbing me. It's not as easy to survive as I make it look.
* SelectiveObliviousness: One could make a case for Ichigo seeing as his hollow, who's a part of him, never fails to point out his ChickMagnet status.
* SetRightWhatOnceWentWrong: 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 rattle off several treatments for tuberculosis [[TaughtByTelevision because of an episode of]] ''Series/{{House}}'' he saw.
** Orihime says Ichigo's adventures could be printed in ''Magazine/ShonenJump''.
** Isshin gets one to ''Film/ThePrincessBride''. [[MyNameIsInigoMontoya Take a wild]] [[YouKilledMyFather guess on]] [[PrepareToDie what it is.]]
** Unohana gets one to ''The Princess Bride'', 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: When Aizen decides to [[spoiler:make the King's Key out of Ichigo instead of Karakura Town]], he doesn't realize [[spoiler:Ichigo now has another zanpakuto]]. [[spoiler:Muramasa]] [[BigDamnHeroes 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 often run this way.
* 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 Disguised Hostage Gambit, most of The Cavalry get knocked out before any damage is inflicted on them or the hostages. It fails to work on Kyoraku and is deemed 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 everyone's memories will be erased in the future (i.e., the events of the third film). [[spoiler:It also ends up being useful for identification against Aizen's illusions.]]
** 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.
-->'''Kurosaki Ichigo:''' This isn't right. This is what he wants. Us distracted. Always reacting to what he does.
* ViolenceIsTheOnlyOption: Oddly for [[{{Shounen}} the genre]], largely averted: most of the 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 does 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]]." The hollow has to inform her that it actually happened.
* WoundThatWillNotHeal: One side of the power of [[spoiler: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 (which comes 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.