Since ''LightNovel/ACertainMagicalIndex'' is very long and its details vary in its various media, this recap will group by story arcs, taking note of the differences between the light novel, anime, and manga adaptations. See [[Recap/ACertainScientificRailgun here]] for ''Manga/ACertainScientificRailgun'''s recap page.

'''Warning!''' Recap pages do not get spoiler tags. All spoilers on these pages will be '''unmarked'''.

!Original Series
# Vol.1 [[Recap/ACertainMagicalIndexArc1Index Index]]
# Vol.2 [[Recap/ACertainMagicalIndexArc2DeepBlood Deep Blood]]
# Vol.3 [[Recap/ACertainMagicalIndexArc3Sisters Sisters]]
# Vol.4 [[Recap/ACertainMagicalIndexArc4AngelFall Angel Fall]]
# Vol.5 [[Recap/ACertainMagicalIndexArc5ThreeStories Three Stories]]
# Vol.6 [[Recap/ACertainMagicalIndexArc6HyoukaKazakiri Hyouka Kazakiri]]
# Vol.7 [[Recap/ACertainMagicalIndexArc7OrsolaAquinasRescue Orsola Aquinas Rescue]]
# Vol.8 [[Recap/ACertainMagicalIndexArc8TreeDiagramRemnant Tree Diagram Remnant]]
# Vol.9-10 [[Recap/ACertainMagicalIndexArc9DaihaseiFestival Daihasei Festival]]
# Vol.11 [[Recap/ACertainMagicalIndexArc10TheQueenOfTheAdriaticSea The Queen Of The Adriatic Sea]]
# Vol.12-13 [[Recap/ACertainMagicalIndexArc11AcademyCityInvasion Academy City Invasion]]
# SS.1 [[Recap/ACertainMagicalIndexArc12SkillOutUprising Skill-Out Uprising]]
# Vol.14 [[Recap/ACertainMagicalIndexArc13DocumentOfConstantine Document Of Constantine]]
# Vol.15 [[Recap/ACertainMagicalIndexArc14BattleRoyale Battle Royale]]
# Vol.16 [[Recap/ACertainMagicalIndexArc15AcquaOfTheBack Acqua Of The Back]]
# SS.2 [[Recap/ACertainMagicalIndexArc16GemstoneMining Gemstone Mining]]
# Vol.17-18 [[Recap/ACertainMagicalIndexArc17BritishRoyalFamily British Royal Family]]
# Vol.19 [[Recap/ACertainMagicalIndexArc18DRAGON DRAGON]]
# Vol.20-22 [[Recap/ACertainMagicalIndexArc19WorldWarIII World War III]]

!New Testament
# Vol.1 [[Recap/ACertainMagicalIndexArc20Freshmen Freshmen]]
# Vol.2 [[Recap/ACertainMagicalIndexArc21Homecoming Homecoming]]
# Vol.3 [[Recap/ACertainMagicalIndexArc22HawaiiInvasion Hawaii Invasion]]
# Vol.4 [[Recap/ACertainMagicalIndexArc23BaggageCity Baggage City]]
# Vol.5-6 [[Recap/ACertainMagicalIndexArc24IchihanaranFestival Ichihanaran Festival]]
# Vol.7 [[Recap/ACertainMagicalIndexArc25AgitateHalation Agitate Halation]]
# Vol.8-10 [[Recap/ACertainMagicalIndexArc26MagicGodOthinus Magic God Othinus]]
# Vol.11 [[Recap/ACertainMagicalIndexArc27MentalOut Mental Out]]
# Vol.12 [[Recap/ACertainMagicalIndexArc28StGermain St. Germain]]
# Vol.13 [[Recap/ACertainMagicalIndexArc29MagicGodHighPriest Magic God High Priest]]

!Side Stories
The chronological order of these side stories in relation with the original series and with each other is not clear.
# [[Recap/ACertainMagicalIndexSS1SP SP]]
# [[Recap/ACertainMagicalIndexSS2NorseMythology Norse Mythology]]
# [[Recap/ACertainMagicalIndexSS3RoadToEndymion Road To Endymion]]
# [[Recap/ACertainMagicalIndexSS4MiracleOfEndymion Miracle Of Endymion]]
# [[Recap/ACertainMagicalIndexSS5NecessariusSpecialEntranceExam Necessarius Special Entrance Exam]]
# [[Recap/ACertainMagicalIndexSS6LoveLetterCompetition Love Letter Competition]]
# [[Recap/ACertainMagicalIndexSS7NewTestamentSS New Testament SS]]