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
# [[Recap/ACertainMagicalIndexArc1Index Index]]
# [[Recap/ACertainMagicalIndexArc2DeepBlood Deep Blood]]
# [[Recap/ACertainMagicalIndexArc3Sisters Sisters]]
# [[Recap/ACertainMagicalIndexArc4AngelFall Angel Fall]]
# [[Recap/ACertainMagicalIndexArc5ThreeStories Three Stories]]
# [[Recap/ACertainMagicalIndexArc6HyoukaKazakiri Hyouka Kazakiri]]
# [[Recap/ACertainMagicalIndexArc7OrsolaAquinasRescue Orsola Aquinas Rescue]]
# [[Recap/ACertainMagicalIndexArc8TreeDiagramRemnant Tree Diagram Remnant]]
# [[Recap/ACertainMagicalIndexArc9DaihaseiFestival Daihasei Festival]]
# [[Recap/ACertainMagicalIndexArc10TheQueenOfTheAdriaticSea The Queen Of The Adriatic Sea]]
# [[Recap/ACertainMagicalIndexArc11AcademyCityInvasion Academy City Invasion]]
# [[Recap/ACertainMagicalIndexArc12SkillOutUprising Skill-Out Uprising]]
# [[Recap/ACertainMagicalIndexArc13DocumentOfConstantine Document Of Constantine]]
# [[Recap/ACertainMagicalIndexArc14BattleRoyale Battle Royale]]
# [[Recap/ACertainMagicalIndexArc15AcquaOfTheBack Acqua Of The Back]]
# [[Recap/ACertainMagicalIndexArc16EnglishCivilWar English Civil War]]
# [[Recap/ACertainMagicalIndexArc17DRAGON DRAGON]]
# [[Recap/ACertainMagicalIndexArc18WorldWarIII World War III]]

!New Testament
# [[Recap/ACertainMagicalIndexArc19Freshmen Freshmen]]
# [[Recap/ACertainMagicalIndexArc20Homecoming Homecoming]]
# [[Recap/ACertainMagicalIndexArc21HawaiiInvasion Hawaii Invasion]]
# [[Recap/ACertainMagicalIndexArc22BaggageCity Baggage City]]
# [[Recap/ACertainMagicalIndexArc23IchihanaranFestival Ichihanaran Festival]]
# [[Recap/ACertainMagicalIndexArc24AgitateHalation Agitate Halation]]
# [[Recap/ACertainMagicalIndexArc25MagicGodOthinus Magic God Othinus]]

!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/ACertainMagicalIndexSS2 SS2]]
# [[Recap/ACertainMagicalIndexSS3NorseMythology Norse Mythology]]
# [[Recap/ACertainMagicalIndexSS4RoadToEndymion Road To Endymion]]
# [[Recap/ACertainMagicalIndexSS5MiracleOfEndymion Miracle Of Endymion]]
# [[Recap/ACertainMagicalIndexSS6NecessariusSpecialEntranceExam Necessarius Special Entrance Exam]]
# [[Recap/ACertainMagicalIndexSS7LoveLetterCompetition Love Letter Competition]]
# [[Recap/ACertainMagicalIndexSS8NewTestamentSS New Testament SS]]