A LightNovel/HaruhiSuzumiya[=/=]LightNovel/ACertainMagicalIndex crossover. Creator/AleisterCrowley learns about the existence and [[RealityWarper the power]] of Haruhi Suzumiya and sends Touma (as an exchange student) and several other agents to test his theories about her. Meanwhile, the SOS Brigade (sans the leader) is informed of this and tries its best to not to cause any trouble and ESPECIALLY to prevent [[AntiMagic Touma]] from touching Haruhi, while the latter tries to stalk him so she can find more about Academy City. '''HilarityEnsues'''.

First arc ended in chapter 10, second arc ended at chapter 18, and third arc ended at chapter 22. Currently in the fourth arc.

Check it out [[http://www.fanfiction.net/s/5900096/1/Suzumiya_Haruhi_no_Index here]].
----
!!This Fanfic Provides Examples of:
* BigEater: Index, just as much in the original material if not more, at one point she eats so much free ramen she actually manages to make the stand bankrupt and it's owner cry.
* BrickJoke: Haruhi reads a paper on stem cell research and becomes interested. Several chapters later, Heaven Canceller out of nowhere declares he will work on stem cell research, and Kyon deduces that Haruhi's power caused this.
* BrokeEpisode: In chapter 13, the brigade has to work in the family restaurant they always go to so they can help Kyon [[spoiler: pay for his trip to Academy City.]]
* ClarkKenting: Haruhi is able to disguise herself with a pair of shades. Kyon comments that normally, it wouldn't work, but since Haruhi believes it would, it does.
* DoNotCallMePaul: Vento of the Front goes undercover as a student. Her classmates comment her real name is pretty, but she insists everyone call her Vento.
* DontYouDarePityMe: Touma beats the crap out of [[spoiler:Kakine]] and looks down on him with regret. He doesn't take it well.
* EroticDream: Kyon has one about [[spoiler: both Mugino and Asakura.]]
* EvilerThanThou: [[spoiler:Asakura Ryoko Vs. Vento of the Front.]] The segment where this fight happens was even named after this trope.
* FastballSpecial: [[spoiler:Emiri Kimidori]] flings Touma into the sky so he can punch a flying [[spoiler:Kakine.]]
* FingerPokeOfDoom: Haruhi is able to bypass Accelerator's powers and flick him in the nose.
* FlorenceNightingaleEffect: [[spoiler:After Kakine is defeated by Touma, Kuyou takes him in and nurses him back to health. They start dating.]]
* ForScience: Crowley doesn't care that negating Haruhi's power or otherwise messing with her could potentially destroy the universe, he's ''curious''.
* GirlOnGirlIsHot: When the adult Asahina from the future gives Kaori Kanzaki a hug, resulting in their boobs pressing together, Kyon finds it arousing, then berates himself for his dirty thoughts.
* GodGuise: The magicians worship Haruhi behind her back, believing her to be The One True God, except for [[spoiler: the Roman Catholic Church, who think she's a heretic who stole God's power. Then in the third arc it's revealed that the Roman Catholic Church believes it's Sasaki who's The One True God.]]
* IdolSinger: Haruhi becomes the talk of Academy City after an impromptu performance. She does have the voice of God, after all.
* MistakenForPrankCall: When several nuns fall under God's Divine Punishment, Sister Angeline and later Haruhi try to call the hospital for them, only to be dismissed as prank callers.
* ObliviousToLove: Like in canon, Kyon does not notice most girl's feelings. When [[spoiler:Mugino]] starts hitting on him, he doesn't understand why this pisses Nagato off. Several characters from the Magic Side refer to him as "the one closest to her", and he doesn't get what that means.
* ThePenIsMightier: When some pervert tries to take an up-skirt photo of Asahina, Haruhi angry throws a pen that nails him in the arm.
* RescueRomance: When Kyon rescues [[spoiler:Mugino]] she instantly ''lusts'' after him, much to his ''horror''.
* RightForTheWrongReasons: Haruhi correctly deduces that the comatose nuns are suffering from oxygen deprivation when she notices the room isn't properly ventilated, but the real source is God's Divine Punishment.
* RunningGag:
** Kyon arriving last to something and Haruhi berating him for being late.
** Kyon thinking about something and then Haruhi yelling at him to hurry up. He'll look up bewildered to find everyone had walked away.
* UsefulNotes/SchrodingersCat: Thanks to Haruhi's subconscious RealityWarper powers, when asked to guess a card randomly drawn from a deck, she can guess a card ''that isn't in the deck'' and get it right. Some observers describe this as if someone did the Schrodinger's Cat experiment... and pulled a dog out of the box.
* ShoutOut:
--> '''Saten''': "So Haruhi san, tell me [[Manga/LuckyStar which side of a chocolate cornet do you eat first?]]"
--> '''Mugino''': "Mugi chan she says… [[Manga/KOn what am I some kind of moeblob now? My eyebrows are perfect damn it!]]"
--> '''Haruhi''': "You know what they say [[VideoGame/RecettearAnItemShopsTale Capitalism, Ho!]]"
** [[spoiler: When in the closed space that formed when Touma touched Haruhi,]] Kyon says that Kanzaki and Nagato carved "a weird circle that looked like something out of that [[Manga/FullmetalAlchemist alchemist manga that ended recently]]."
** The scene where Index was visiting Touma in the hospital [[TrademarkFavoriteFood while eating melon bread, and eventually offering one to Touma]] reminds one of [[LightNovel/ShakuganNoShana a certain blazing]] {{Tsundere}}.
** Terra of the Left's EvilLaugh is described as sounding like [[SelfDemonstrating/TheJoker an evil clown that likes to torment bat themed superheroes]].
* SurveillanceAsThePlotDemands: Aleister Crowley is able to see nearly anywhere, ''even inside Closed Space''. Lampshaded by Motoharu.
-->"Mind if I ask something… how did you saw all that stuff?"
* TeethClenchedTeamwork: Team ITEM and Team SCHOOL are hired for the same job. They can't stand each other.
* TimeStandsStill:
** [[spoiler: When Touma touches Haruhi with Imagine Breaker, this happens as Closed Space/the universe starts being negated/erased. Fortunately, the people who were unaffected manage to separate them before it is too late.]]
** At one point, a sleeping Haruhi makes all clocks and the moon and stars to stop moving for about an hour, though everyone is aware and wondering what is going on.
** [[spoiler: Nagato uses the power to freeze time to effortlessly defeat Accelerator.]]
* TwinThreesomeFantasy: Kuroko desires it when she meets Misaka 11111, aka Ichigo Misaka. Mikoto says it's not going to happen.
* TheUnreveal:
** Once the SOS Brigade realizes that Touma is not affected by Haruhi's powers, they excitedly ask him what happened in the TimeCrash Three Years Ago. Touma sadly informs them about his amnesia.
** When Kyon uses his real name, Kanzaki says it's really beautiful and asks why he doesn't use it more often. The reader doesn't get to see the name.
** Vento of the Front's real name gets the same treatment.
* UnwantedHarem: Touma, just like, if not more than, in the original; by now, he (of course unintentionally) charmed one-tenth of entire female population of North High.
* WhamEpisode: Chapter 11. The SOS Brigade [[spoiler:gets invited to Academy City]].
* WhamLine:
** You know the first line Haruhi spoke in the original source? She says it again...[[spoiler:[[{{HSQ}} IN]] [[OhCrap ACADEMY CITY]]]]!!
** In Chapter 18, Aleister receives a phone call: [[spoiler: "My name is... John Smith."]]
* WhatDoesSheSeeInHim: A few characters wonder why Haruhi loves Kyon, commenting that he's plain and there's nothing special about him at all. Similarly, [[spoiler:Frenda doesn't understand why Mugino likes him.]]
* WhatTheHellHero: Tsuchimakaido receives this from nearly everyone else for telling Aleister about Haruhi in the first place just so he could have a bargaining chip to legalize marriage between NotBloodSiblings. Hell, even ''Aleister'' calls him on it.
-->'''Aleister''': I refuse to take morals lessons from someone that sold off his God just because he wanted to marry his sister.
* WhoWritesThisCrap: Haruhi asks who thought Touma and her touching each other being big deal was a good idea for a plot and says it's ridiculous, [[spoiler: referring to what she thought was a play the brigade had done for her.]]
* WithCatlikeTread: Kaori Kanazaki twice fails to sneak attack Shizuri Mugino because she called her Nanasen attack. After the second attempt, Mugino points out that CallingYourAttacks defeats the purpose of a sneak attack.
* WorthIt: While the SOS Brigade is working in the restaurant, Taniguchi orders cup after cup of coffee, trying to get Kanzaki or Asahina, who are waitresses, to come to his table. Haruhi foils his attempts by having Kyon take and deliver his orders. After his ''97th'' cup, Kyon takes pity on him and asks Kanzaki to finally serve him. Taniguchi is ecstatic and says it was worth losing almost all his money.
* XanatosGambit: Aleister's plans in the second arc. While he was not able to get Haruhi to enroll in school at Academy City, he was able to perform all sorts of tests on her and see many examples of her power in action, enabling him to collect a lot of data. He also is able to lure operatives of the Time Travelers Agency and the Integrated Data Sentient Entity on to his home turf, allowing him to collect data on them and to more accurately assess what sort of threat they might pose to his plans.
* {{Yandere}}: Hilariously enough, [[spoiler:Mugino]] becomes one for Kyon.