''Devil Ärms'' is a short series of ''[[MagicalGirlLyricalNanoha Mahou Shoujo Lyrical Nanoha StrikerS]]'' FanFic that deals with the life of Kimura Yuuki, who comes across half of an ancient and powerful [[LostTechnology Lost Logia]] known as the [[MacGuffin Devil]] [[TitleDrop Ärms]] and ends up being taken into custody by the Time Space Administration Bureau. His real name is not revealed until the epilogue of the first story and until then he goes by the name of [[IronicNickname Kurosawa]] [[ThemeNaming Kuro]] due to carrying the darkness half of the Devil Ärms while his Childhood Friend Kobayashi Kasumi goes by the name Hashimoto Hikari.

The first story, [[http://www.fanfiction.net/s/4271476/1/Devil_Arms_LegendS "LegendS,"]] is a SelfInsertFic that deals with Yuuki experience during the Strikers timeline as a member of Section Six's Stars Squad and most notably his interactions with the members of the squad. Overall the fic is full of lighthearted comedy with a few bits of drama and romance.

The second story, [[http://www.fanfiction.net/s/4402899/1/Devil_Arms_StarS "StarS,"]] takes place three months after the end of the first taking place on [[InsignificantLittleBluePlanet Earth]]. Yuuki having acquired [[spoiler:both sides of the Devil Ärms]] is put in charge of an investigation involving multiple thefts throughout TSAB space leading into a small war with an unknown force that uses cyborgs as soldiers. This story introduces more original characters and is an original story. It starts out with the same light-hearted comedy as its prequel but becomes DarkerAndEdgier with many mysteries being cleared up and even more showing up.

The third story, [[http://www.fanfiction.net/s/7173938/1/Devil_Arms_ReturnerS "ReturnerS"]], takes place in Mid-Childa three years after the end of [=StarS=], featuring yet another new threat and a mysterious ally that greatly resembles Yuuki...

Not to be confused with the [[EmpathicWeapon sentient]] [[CompanionCube weapons]] [[Franchise/DevilMayCry Dante]] encounters during his adventures.
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!!Tropes found in this FanFic:

* AccidentalPervert - Subaru to [[spoiler:Yuuki]] when she walks in on him getting ready to take a shower.
* ActionGirl - Quite a few but the most notable are Subaru, Teana, Kasumi, [[spoiler:Asakura]].
* ActionMom - Aoi. Heck she even threatens [[spoiler:Subaru]] with a gun!
* AlternateHistory - [[spoiler: The Neo-Belkan Empire is what happens if Asakura never returned to the past.]]
* AntiMagic - The new cyborg enemies can weaken and even negate magic in an entire area if there are enough of them around.
** The enemies in [=ReturnerS=] ''consume'' magic.
* ArmedLegs[=/=]KickChick - [[spoiler:''Sakura'', of all people. Her devices are based on Yuuki's and Subaru's, but her main offensive device is based on Subaru's ''non-offensive'' one, Mach Caliber--only instead of rollerblades, hers are ''ice skates''.]]
* ArtifactOfDeath - The Devil Ärms can be if it's wielder so desired, but luckily it's current one doesn't care for that.
* ArtificialLimbs - Sakura eventually gets these to replace her amputated legs. [[spoiler:Asakura's legs are artificial, too, just one of the clues that she's Sakura's future self.]]
* BackFromTheDead - The Mirage class cyborgs used by the [[spoiler:Neo-Belkan Empire. Who turn out to be revived versions of Subaru, Teana, and Alex]].
* BadFuture - [[spoiler:The future that Asakura comes from where everyone is dead and the evil emperor Null Enders rules.]]
* BadassFamily - The Kimura family. Aoi was a former TSAB Admiral before starting a family [[spoiler:and is reinstated into the TSAB, albeit at a lower rank]], her husband Shichiro was a soldier on Earth before meeting her, and their son Yuuki is the host to a powerful Lost Logia. [[spoiler:Their daughter Sakura also becomes a mage in [=ReturnerS=].]]
* BadassLongcoat - [[spoiler:Null Enders sports one when he activates his device.]]
* BlackKnight - [[spoiler: Null Enders]] and Yuuki's colors are generally black.
* BerserkButton - Harming Yuuki's friends and family will lead you toward the wrong end of the [[spoiler:[[DeadlyUpgrade Berserk Form]].]]
* {{BFG}}
* {{BFS}}
* BigBad - [[spoiler: Null Enders]].
* BottomlessMagazines - The weapons used by the [[spoiler:Neo-Belkan Empire]]
* BrainwashedAndCrazy - [[spoiler:Subaru]] after being capture by the Cyber Knights, which leads to a IKnowYouAreInThereSomewhereFight.
* ButtMonkey - Yuuki is often portrayed as one, taking punishment from most of the other characters.
** Edward becomes one later on, usually as a result of things [[BastardGirlfriend Ayumi]] does.
* CallingYourAttacks - It's based of a MagicalGirl show...what do you expect?
* CatchPhrase - Game. Set. Match.
* ChildhoodFriendRomance - Kasumi and Shou are married as of [=ReturnerS=]
* CoolStarship - The Stargazer
* DeadpanSnarker - Ayumi though she may be more of a LittleMissSnarker.
* DemotedToExtra - Shichiro aka Yuuki father.
* DoomedHometown - [[spoiler:Yuuki]]'s hometown is bombed to bits by the [[spoiler:Cyber Knights]].
* EmperorScientist - Null Enders due to his [[spoiler:discovery of the cyborg army and the technology used by the Neo-Belkan Empire]].
* EvilCounterpart - [[spoiler:Null Enders to Yuuki.]]
* FirstGirlWins - Subverted by Kasumi, who says straight out that she can only think of Yuuki as a brother.
* FirstPersonSmartass - Yuuki of course.
* FullNameBasis - Everyone to Null Enders.
* FutureBadass - [[spoiler:Asakura]]
* GetAHoldOfYourselfMan - Aoi to [[spoiler:Yuuki]] after his HeroicBSOD episode below. Complete with a [[GetAHoldOfYourselfMan Bright Punch.]]
* GoOutWithASmile - [[spoiler: Edward goes out with some last words to Ayumi.]]
* HealingFactor - One of the many perks that the Devil Ärms give to its host.
* HeroicBSOD - [[spoiler:Yuuki]] after most of his family and two childhood friends are nuked by the Cyber Knights.
* HeroicResolve - Yuuki after [[spoiler:Edward dies]], determined not to let anymore people die.
* HollywoodCyborg - Pretty much everyone in the Cyber Knights and [[spoiler: Neo-Belkan Army]].
* HolographicTerminal
* HumongousMecha - [[spoiler:Angra Mainyu]] pulls one out when he was backed into a corner.
* IJustWantToBeNormal - Averted at the beginning of the first story by Yuuki, but played straight during the second story when he is tired of everything that's happening.
* IdiotBall - Yuuki for deciding to take a walk after his city was just hit by multiple missiles.
* IllGirl - Sakura, who had her legs amputated before the series began.
* IKnowYouAreInThereSomewhereFight - [[spoiler: Yuuki to Subaru.]]
* ImpossiblyCoolClothes
* ImprobableWeaponUser - Subaru decides to ram her Wing Road right through [[spoiler:Angra Mainyu's HumongousMecha.]]
* InstantArmor
* KineticWeaponsAreJustBetter - The weapons of the Cyber Knights and in turn, the [[spoiler:Neo-Belkan Empire]].
* JumpedAtTheCall - Yuuki had no problems being taken by an Alien force and placed into its military.
** [[spoiler:Sakura outright joined of her own free will.]]
* LethalChef - Aoi according to her son.
* LockAndLoadMontage / TransformationSequence - Described in the first story, but the second one doesn't use it anymore.
* LoveTriangle - [[spoiler:Turns out Teana had feelings for Yuuki too. In the BadFuture, they actually lived together after Subaru's death.]]
* MechaMooks - The Hunter and Gadget Drones
* MismatchedEyes - [[spoiler:Subaru gets these after temporarily being turned into a Titan.]]
* [[MrExposition Mrs. Exposition]] - [[spoiler:Asakura.]]
* MoodWhiplash - We go from a case short of HeroicBSOD to a BeachEpisode to someone getting shot at the heart.
* {{Narrator}} - Yuuki, mostly but some chapters have Subaru doing the narration.
* NeverFoundTheBody - [[spoiler:Null Enders aka Future Yuuki ''believes'' that everyone he loved was dead in his time period, but it's heavily implied that Asakura, who ''isn't'' a Mirage, is his sister Sakura.]]
** Also [[spoiler:Edward]].
* NoodleIncident - Something that Amia did in her days in the academy, apparently for Nathan's sake.
-->'''Ayumi:''' What in the world would you need..."[[NoodleImplements a fire hose, a three-story ladder, a pickaxe, and a cow]]" for?
-->'''Nathan:''' Wait that was you?
-->'''Amia:''' Those jerks were saying horrible things about you! And I had no idea it would crash through the wall like that!
* OnTheNext
* OneWingedAngel - Played with by both Yuuki and Kasumi as their initial forms have one feathered wing.
** [[spoiler:Null Enders and Yuuki]] get these at the end of [=StarS=]
* OriginalCharacter - Yuuki, Kasumi, Edward, Alex, Sakura...
* PowerGivesYouWings - The Devil Ärms give its host a wing of the same color as the half they hold.
* PublicBathhouseScene - More than one in the third story.
* PutOnABus - Pretty much all the non-original characters in Legends except for Subaru and Teana.
* ShootingGallery - Yuuki and Kasumi go through one when they first arrive at Section Six.
* SphereOfDestruction - The missiles shot at the DoomedHometown.
* SplitPersonality - Nathaniel. When he has his glasses, he's Nathan; without them, he's Daniel.
* TallDarkAndHandsome - Yuuki, or so he'd like to think.
* TeachHimAnger - Aoi prevents Nanoha from stopping [[spoiler: Yuuki]] from beating [[spoiler:Angra Mainyu]] to death for his crimes.
* TheMole - [[spoiler:Asakura's forces placed themselves amongst the Cyber Knights in order to protect the main cast.]]
* TheReveal - [[spoiler:The Cyber Knights are from the future where most of the cast has died and the TSAB was destroyed by the Neo-Belkan Empire lead by Null Enders.]]
* TimeSkip - Three months in between the first and second stories; three years between the second and third.
* TronLines - The design on the Devil Ärms.
* UnstoppableRage - [[spoiler: Yuuki]], when finally meeting [[spoiler:Angra Mainyu]] face to face, causing him to try to kill him.
* WhoWouldWantToWatchUs - Yuuki sometimes comments that his life is like a bad fan fic.
* WifeHusbandry - Shou accuses Alex of doing this, referencing the former TropeNamer by name, as well as of being a {{Lolicon}} in regards to his relationship with Sakura. In reality he's acting more as a surrogate big brother than a father, as they're only five years apart.
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