ShortRunner animes running 10-14 episodes (generally 12), about half the standard 24-26 episode season (holidays depending). Shows that are successful often get another season, essentially achieving a "normal" length. They're usually scheduled for a 3-month airing slot, if aired weekly, at OtakuOClock.[[note]]Japanese television has four general "windows" in which to premier a series, and (like most things Japanese) these windows are quite rigid. They are the first week(-ish) of January, April, July, and October; these form the "Winter", "Spring", "Summer", and "Fall" seasons respectively. So, if an anime first premiered in "Fall 2011", that means it began in October of that year. Traditionally, the Fall and Spring windows are considered more important by networks and Winter by far the least important.[[/note]]

This format became popular (see [[http://www.google.com/search?q=site%3Aanimenewsnetwork.com+inurl%3A%22encyclopedia%2Fanime.php%22+%22Number+of+episodes%3A+12%22 12]] and [[http://www.google.com/search?q=site%3Aanimenewsnetwork.com+inurl%3A%22encyclopedia%2Fanime.php%22+%22Number+of+episodes%3A+13%22 13]]) the second half of the TurnOfTheMillennium as a compromise to the often sporadic nature of {{OVA}}s and the longer, sometimes filler-ridden, standard season. Being a smaller time investment and financial risk, it is much easier to determine if a show will be successful; or, if it isn't, to not take on as much of a loss. For this reason, many Western live-action shows have adopted this schedule, at least at first (See Front13Back9).

It's also common for seasons to have 13 episodes produced, broadcasting only 12 of them, and leaving the 13th as a BonusEpisode {{OVA}}. This is especially found in shows showing controversial, taboo, and/or explicit {{fanservice}} scenes. In this case, whatever needs to bypass the MoralWatchdogs is usually written at the end and takes place in the OVA.

An increasing number of anime series specifically geared toward otaku (most of them part of the Creator/{{noitaminA}} programming block) are airing single seasons of ''eleven'' episodes. Although rare, it is also not unheard of for a series to contain ''fourteen'' episodes in its original broadcast. These are also listed below.

The approximately twelve-episode format is also commonly called '1-cour' or simply 'cour' which is shorter than 'Twelve-Episode Anime' and less ambiguous than a 'season', which are usually used for installments in the series. Likewise, a standard 24-26 episode run would be '2-cour' and so on. 'Cour' (kuuru/クール), probably from the French ''cours'', is a jargon term used in the Japanese broadcasting industry referring to these periods of time both in production and as they are generally scheduled by TV stations.

The only real downside to this format is that if the anime is based on a manga that's still running and unlikely to receive a second season, expect a GeckoEnding. And due their length, great 12 episode anime will often lead to severe cases of AwesomenessWithdrawal.

----
[[foldercontrol]]

[[folder:12 Episode Series]]

* ''Manga/DotHackLegendOfTheTwilight Bracelet'' is 12 episodes long, but was also an adaptation of a monthly serial.
* ''Anime/NinetyOneDays''
* ''LightNovel/AbsoluteDuo''
* ''LightNovel/AestheticaOfARogueHero'' (also has 6 specials that are 4 minutes each)
* ''VisualNovel/AkaneIroNiSomaruSaka'', plus an OVA
* ''Manga/AkumaNoRiddle'' plus an OVA.
* ''{{Literature/Another}}'': It has 12 episodes, but also has a (somewhat spoiler-filled) OVA which even uses the same opening and ending credits. Since it chronologically happens before and during the events of the first episode, it could in some regards also be looked at as a 13 episode anime.
* ''VideoGame/AmnesiaOtome''
* ''Manga/AnneHappy''
* ''Manga/AntiqueBakery''
* ''Manga/AoHaruRide''
* ''VideoGame/ArcanaFamiglia'', with an extra OVA.
* ''LightNovel/CatPlanetCuties'' plus an OVA
* ''Manga/BGataHKei'' (Yamada's First Time)
* ''Manga/{{Barakamon}}''
* ''Anime/BenTo''
* ''Anime/Berserk2016''
* ''Manga/BlackBloodBrothers''
* ''Manga/BlackLagoon'' had two seasons of this kind, the second called "The Second Barrage".
* ''Anime/BlazBlueAlterMemory''
* ''Anime/BloodC''
* ''Manga/BokuDakeGaInaiMachi''
* ''Anime/BoogiepopPhantom''
* ''Anime/ChaosDragon''
* ''VisualNovel/ChaosHead''
* ''Anime/CowboyBebop'' in its initial airing was 12 stand-alone episodes and a filler "recap" episode, due to it being too violent for its time slot. The rest of the series was made at the time, but they decided to leave out the more violent episodes for the first run.
* ''LightNovel/CubeXCursedXCurious''
* ''Manga/DailyLifeWithMonsterGirl:'' Plus an upcoming OVA.
* ''Manga/DailyLivesOfHighSchoolBoys''
* ''Anime/DancougarNova:'' The last half especially feels very rushed and underdeveloped.
* ''Manga/DanceInTheVampireBund''
* ''Anime/DarkerThanBlack'''s second season fits, but not the first season and its 24 episodes.
* ''Manga/DeadmanWonderland''
* ''Anime/DeathParade''
* ''Anime/DevilMayCryTheAnimatedSeries''
* ''Manga/DontenNiWarau''
* ''LightNovel/DragonCrisis''
* ''Manga/DuskMaidenOfAmnesia''
* ''VisualNovel/EfATaleOfMemories'' and its sequel ''ef. A Tale of Melodies''
* ''[[Anime/ElHazardTheMagnificentWorld El Hazard: The Alternative World]]''
* ''Manga/{{Erased}}''
* ''VisualNovel/FortuneArterial: Akai Yakusoku''
** ''VideoGame/YoakeMaeYoriRuriIroNa ~Crescent Love~'' is an earlier example of one of August's {{Visual Novel}}s [[AnimatedAdaptation adapted]] into a TwelveEpisodeAnime.
* ''Anime/FullMetalPanicFumoffu'' had 12 episodes produced, with several split into two half-episodes. Two half-episodes were [[TooSoon pulled from broadcast due to a kidnapping plot that had parallels in]] RealLife at the time.
* ''Manga/{{Freezing}}'' plus two OVA episodes.
* ''Anime/FutakoiAlternative'' and its predecessor ''Anime/{{Futakoi}}''.
* ''Anime/GaReiZero''
* ''Anime/GatchamanCrowds'' plus a 13th episode that is a finished version of the 12th.
* ''Anime/{{Grenadier}}''
* ''LightNovel/GroundControlToPsychoelectricGirl''
* ''Manga/GugureKokkurisan'' plus six 5-minute special episodes.
* The "La Verite" remake of ''Anime/HanaukyoMaidTai'' has 12 episodes. So far, no sign of a second season.
* ''Manga/{{Hanayamata}}''
* ''LightNovel/HeavensMemoPad''
* ''Manga/HeIsMyMaster'' (No sequel series yet)
* ''Anime/HiSpeedJecy'' is a 12-episode OVA split across six volumes.
* All four seasons of ''Manga/HidamariSketch'': the first has 12, the second has 13, the third and fourth 12 again. However, between the DVD-only bonus episodes, and some TV specials broadcast some months after the main series run, the totals are 14 per season (or 16 for the third season if one counts the TV specials as part of it).
* ''Manga/HighschoolOfTheDead'' plus an {{OVA}} episode.
* ''Manga/HimoutoUmaruChan''
* ''Manga/{{Hitohira}}''
* ''LightNovel/HowToRaiseABoringGirlfriend''
* ''Anime/InnocentVenus'': unfortunately because of some bad pacing the middle was painfully slow but the later episodes felt too rushed.
* ''Anime/IronMan''
* ''LightNovel/IsThisAZombie'' plus one {{OVA}} episode.
* ''Literature/JokerGame'' plus two unaired episodes bundled with the Blu-ray releases.
* ''Anime/KabaneriOfTheIronFortress''
* ''Anime/{{Kaiba}}''
* ''Manga/KamenNoMaidGuy'' has one 12-episode season so far, but there's rumors of another one following soon.
* ''Manga/KannazukiNoMiko'', and quite a few other works originally created by Kaishaku, for example:
** ''Magical Nyan Nyan Taruto''
** Both ''Anime/UFOUltramaidenValkyrie'' TV series.
** ''Anime/ShatteredAngels''
* ''Manga/KashimashiGirlMeetsGirl''
* ''LightNovel/{{Katanagatari}}''
* ''Manga/KotouraSan''
* ''LightNovel/KureNai''
* ''Literature/{{Kurozuka}}''
* ''Anime/LegendOfHimiko''
* ''Manga/{{Loveless}}''. The manga has 9 volumes, still ongoing.
* ''Manga/MagicalGirlLyricalNanohaVivid'', in comparison to the [[Anime/MagicalGirlLyricalNanoha first]] [[Anime/MagicalGirlLyricalNanohaAs two]] seasons (13 episodes) and the [[Anime/MagicalGirlLyricalNanohaStrikers third]] season (26 episodes).
* ''Manga/{{Mahoromatic}}'' got 12; its sequel series (subtitled ''Something More Beautiful'') got 14.
* ''Makai Senki Franchise/{{Disgaea}}'', the [[AnimeOfTheGame anime based loosely on the game]].
* ''Anime/ManabiStraight'' plus an OVA, which takes place between the 6th and 7th episodes, to make this series 13 episodes when counted.
* ''Manga/MariaHolic''
* ''LightNovel/{{MM}}''
* ''Anime/{{Mononoke}}''
* ''Manga/MonthlyGirlsNozakiKun'' plus six 3-minute special episodes.
* ''Anime/NajicaBlitzTactics''
* ''VisualNovel/NanatsuiroDrops''
* ''Manga/NewGame''
* ''Anime/{{Nightwalker}}'': A unique case, as the first four episodes were originally released as an OVA series. The following eight episodes were then aired as a television series.
* ''Manga/NininGaShinobuden'', a.k.a (''Ninja Nonsense'' and ''2x2=Shinobuden'')
* ''Manga/OneWeekFriends'' received a 12 episode anime, with special mini-episodes released on the DVD sets.
* ''Anime/PleaseTeacher'' and ''Anime/PleaseTwins'' are twelve episode animes, with [[BonusEpisode one-episode]] {{OVA}}s each.
* ''Manga/ParadiseKiss''
* ''Anime/{{Potemayo}}''
* ''Manga/PrincessPrincess'' ran for 12 episodes following three of the five volumes of manga. No word yet on whether the manga sequel, ''Princess Princess Plus'' will be getting an anime adaptation.
* ''VideoGame/PrismArk''
* ''Anime/PuellaMagiMadokaMagica''
* ''Anime/PunchLine''
* ''Anime/QueensBlade''
* ''Anime/RageOfBahamutGenesis''
* ''Anime/RanpoKitanGameOfLaplace''
* ''Manga/RideBack''
* ''Anime/RocketGirls''
* ''Manga/RozenMaiden'' and its sequel series, ''Rozen Maiden Traumend''.
* ''Anime/SacredSeven''
* ''Manga/SakamichinoApollon''
* ''Manga/SayILoveYou''
* ''Anime/SelectorInfectedWIXOSS''
* ''VideoGame/SengokuBasara'''s first two seasons, including a pair of [=OVA=]s.
* ''Anime/SeraphimCall'' makes good use of this format, devoting one episode to each of its 11 central characters and having them all meet in the last one.
* ''VisualNovel/SchoolDays'', along with two {{OVA}}s
* ''[[VisualNovel/{{Tsukihime}} Shingetsutan Tsukihime]]''
* ''Anime/ShowByRock''
* ''VisualNovel/ShukufukuNoCampanella'', plus an OVA.
* ''LightNovel/DakaraBokuWaHGaDekinai'' plus {{OVA}}
* ''Manga/{{Sola}}''
* ''Manga/SomedaysDreamers''
* ''Manga/SomedaysDreamersIISora''
* ''Anime/SoundOfTheSky''
* ''LightNovel/SundayWithoutGod'': Plus a bonus unaired 13th episode.
* ''LightNovel/TaishoBaseballGirls''
* ''VisualNovel/TogainuNoChi''
* ''Anime/{{Tsuritama}}''
* ''Series/UltramanNeos'': 12 episodes plus [[BonusEpisode a special OVA]].
* ''Anime/UmiMonogatari''
* ''Anime/UtaKata'', which also had a postlude OVA.
* ''Manga/VenusVersusVirus'' had 12 episodes...but ended on a {{cliffhanger}}.
* ''Manga/WanderingSon''. It's a TwelveEpisodeAnime, with only eleven episodes being broadcast on television and one unreleased one being added onto the Blu-Ray.
* ''Anime/{{Wolverine}}''
* ''Manga/TheWorldGodOnlyKnows'' had two seasons 12 episodes long each.
* ''Manga/TheWorldIsStillBeautiful''
* ''[[VideoGame/{{Xenosaga}} Xenosaga: The Animation]]''
* ''Manga/YamadaKunAndTheSevenWitches''. The part of the manga it covers is 90 chapters long, leading to rather mixed reactions by those who had already read the manga. Especially the last half is noteworthily rushed, while the first half is more faithful to the manga.
* ''VisualNovel/YamiToBoushiToHonNoTabibito''
* ''VisualNovel/YosugaNoSora''
* ''Anime/{{Yumeria}}''
[[/folder]]

[[folder:11 Episode Series]]

* ''Manga/AoiHana''
* ''Anime/AnoHanaTheFlowerWeSawThatDay''
* ''Manga/BunnyDrop''
* ''Anime/CTheMoneyAndSoulOfPossibility ''
* ''Anime/EdenOfTheEast'': 11 episodes and two movies.
* ''Anime/{{Fractale}}''
* ''Anime/GalileiDonna''
* ''Anime/GenjiMonogatariSennenki''
* ''Anime/HandMaidMay'' (one of the earliest examples, first aired in 2000)
* ''Manga/HakabaKitaro''
* ''Manga/JyuOhSei''
* ''LightNovel/{{Kampfer}}'' is an odd case; it's 12 episodes, but it's basically an 11 episode series with episode 12 being a fanservicey, non-continuity [[BonusEpisode bonus episode]] that's aired after the ending [[GeckoEnding such as it is]].
* ''Manga/{{Moyashimon}}''
* ''LightNovel/{{No6}}''
* ''Manga/PingPong''
* ''Manga/PrincessJellyfish'', although [[spoiler: the extremely open-ended "finale" leaves a lot of plot threads unresolved.]]
* ''Anime/RanpoKitanGameOfLaplace'', but [[spoiler: the extremely open-ended "finale" leaves a lot of plot threads unresolved.]]
* ''Anime/PsychoPass'' (season 2)
* ''Manga/SilverSpoon'' has two 11-episode seasons.
* ''Literature/TheTatamiGalaxy''
* ''Anime/TokyoMagnitude8''
* ''Literature/{{Trapeze}}''
* ''Series/UltramanGinga'': 11 episodes and two movies.
* ''Manga/WanderingSon''
* ''Anime/ZankyouNoTerror''
* ''Manga/ZombieLoan'' plus two DVD episodes.
[[/folder]]

[[folder:10 Episode Series]]

* ''Manga/BigOrder''
* ''Manga/BloodLad''
* ''LightNovel/CoffinPrincessChaika'' (season 2)
* ''LightNovel/DateALive'' (season 2)
* ''Manga/{{Haikyuu}}'' (season 3)
* ''Manga/HatenkouYuugi''
* ''Manga/InariKonkonKoiIroha''
* ''LightNovel/KonoSubarashiiSekaiNiShukufukuO''
* ''LightNovel/OreNoNounaiSentakushiGaGakuenLoveComeOZenryokuDeJamaShiteiru''
* ''LightNovel/ProblemChildrenAreComingFromAnotherWorldArentThey''
* ''LightNovel/ShinmaiMaouNoTestament'' (season 2)
* ''Manga/TriageX''
[[/folder]]

[[folder:13 Episode Series]]

* ''VisualNovel/{{AIR}}'' TV: though it had 13 episodes, the last was a RecapEpisode and generally discounted.
** The RecapEpisode wasn't even included in the Creator/FUNimation English DVD release.
** There are also two {{OVA}} episodes called ''AIR in Summer''.
* ''VisualNovel/AkaneIroNiSomaruSaka'' -- thirteen episodes plus a {{Fanservice}} OAV.
* ''Anime/AngelBeats'', which was supposed to have 26 episodes and [[ExecutiveMeddling was unexpectedly cut down to 13.]] A [[BonusEpisode bonus OVA]] was released later, and the disk set came with an unaired BizarroEpisode.
* ''LightNovel/{{Baccano}}'' got 13, although episodes 14-16 were released later as bonus material.
* ''LightNovel/BakaAndTestSummonTheBeasts'' ran for two seasons, and each season contained 13 episodes.
* ''Anime/{{Bananya}}''
* ''Anime/TheBigO'', though it was later renewed for a second season.
** The Big O is notable for being one of the first Twelve Episode Anime to get a second season, picking up where the first one left off, after a lengthy break, something which was almost unheard of in the anime industry at the time.
* ''Manga/BlueDrop''
* ''Anime/BottleFairy''
* ''Anime/{{Canaan}}''
* The Creator/MonkeyPunch anime ''Anime/CinderellaBoy''. The series ended [[spoiler: whilst Ranma/Rella's daily FreakyFridayFlip still wasn't resolved]] and originally suggested an upcoming new season. Unfortunately, the high cost caused the series to be put to a premature end.
* The anime of ''VisualNovel/{{Danganronpa}}'', [[ThirteenIsUnlucky which suits the series just fine]].
* ''Manga/DescendantsOfDarkness''
* ''Manga/ICantUnderstandWhatMyHusbandIsSaying'' has two thirteen episode seasons.
* The original series ''Literature/DeepLove'' was thirteen episodes, while the spin-off ''Deep Love ~Host~'' ran for twelve.
* The anime of ''VideoGame/DevilSurvivor2''
* ''Anime/DivergenceEve'' has two thirteen-episode seasons.
* ''Anime/EarthMaidenArjuna''
* ''Manga/ElfenLied'' is a ThirteenEpisodeAnime, plus [[BonusEpisode the 14th DVD-only episode]].
* ''Anime/Figure17TsubasaAndHikaru'' has 13 episodes, but is somewhat unique in that each episode is 45 minutes long, and one episode was shown each month during its first airing. As such, the anime takes significantly more time exploring and developing its characters, has a gentler pace, and animation and art that's practically OVA quality.
** It was later rebroadcast as a standard 26 episode show, with each episode cut in half.
* ''Anime/{{Flag}}''
* ''[[LightNovel/FullMetalPanic Full Metal Panic! The Second Raid]]'' had 13 episodes, with a separate 30 minute {{OAV}} produced afterwards.
* ''Manga/{{Gravitation}}'', 13, cut so heavily it would need a sequel series to bridge the gap to the manga's sequel series...
* ''Manga/GunslingerGirl'', with 13 episodes and a 13-episode sequel, as well as a 2-episode OVA.
* Manga/HappyHappyClover had a total of 13 episodes made in 2007 which adapted the first three volumes.
* ''Anime/HaibaneRenmei'', written by ''Lain''[='=]s character designer Yoshitoshi [=ABe=], is also a 13-episode series.
* ''Anime/{{Hellsing}}'' got 13 episodes. It needed more to tell the story it was trying to.
** That's only because the author pulled the plug on it because he apparently didn't like where it was going. All funding was cut around episode 10-11, and they had just enough to wrap up the series in the next two-three episodes.
*** ''Hellsing TV'' never had a chance, honestly. It was commissioned when the (monthly) comic had been around for less than a year. It OvertookTheManga after just seven episodes (incidentally ''before'' it was clear who [[ThoseWackyNazis the antagonist was]]), and the creator apparently gave zero guidance as to how the story should proceed, leading to the deeply unpopular ending. The show never had much of a budget to begin with, and cutting that only made matters worse.
* ''Series/HikoninSentaiAkibaranger'' is a rare live action example. Interestingly, it was originally supposed to be a one season show with twelve episodes, but the budget increased for one more episode. Then, a second season was made that also lasted thirteen episodes.
* ''Hyakko''' has 13 episodes and a short 12-minute-long OVA.
* The first ''VisualNovel/{{Kanon}}'' TV adaptation is 13 episodes long plus a special. The [[KyotoAnimation KyoAni]] remake was a full season with 24 episodes.
* ''Anime/IlSolePenetraLeIllusioni'': Plus an unaired 14th episode that serves as a prequel.
* ''Anime/JubeiChan: Secret of the Lovely Eyepatch'' and the second season ''Counter Attack of the Siberia Yagyu''.
* ''Anime/{{K}}''
* ''Manga/{{Kannagi}}''
* ''Anime/KazemakaseTsukikageRan''
* ''Anime/KeyTheMetalIdol'' -- though it came out as a total of 15 episodes: 13 regular, plus two "movies".
* ''[[Series/{{Kikaider}} Android Kikaider: The Animation]]'' has 13 episodes once "recap episode" #8 is added in. However, this episode was not shown during ''Kikaider's'' Adult Swim run, nor was it put onto DVD.
** The TV series is followed up by a 4-episode OVA, loosely based on the ''Kikaider 01'' tokusatsu series.
* ''LightNovel/KinosJourney'' is another 13-episode series.
* ''Kokoro Library''
* ''LegendsOfTheDarkKings'' (aka ''Ten no Haoh''), a 13-episode anime adaptation of a manga spinoff of ''FistOfTheNorthStar'' that centers around [[BigBad Raoh]].
* ''Manga/LoveLab''
* ''Anime/LupinIIITheWomanCalledFujikoMine'' (the "12th" episode is a two-parter, making 13 episodes in total)
* ''Anime/MagicalGirlLyricalNanoha'' and its sequel series ''Anime/MagicalGirlLyricalNanohaAs'' compacted 26 episodes of plot into 13 high-pressure episodes; however, ''Anime/MagicalGirlLyricalNanohaStrikers'' was the standard length (and pace) of a 26 episode series.
* ''LightNovel/MayoiNekoOverrun'' has twelve episodes plus a {{metafiction}}al thirteenth episode of the characters doing commentary on the series.
* ''Anime/MetalFighterMiku''
* ''Anime/MezzoDSA''
* ''Manga/MidoriDays'' got 13 episodes (which is probably why two major characters from the manga, Lucy and Nao, were left out).
* ''Anime/MyselfYourself''
* ''Manga/{{Narutaru}}'' got 13 episodes. 13 episodes that ''literally'' left out half the plot of the manga it's based on.
* ''Anime/NieaUnder7''
* ''VideoGame/NeoAngelique'': TheAnimeOfTheGame SpinOff is two sets of 13 episodes.
* ''Anime/NowAndThenHereAndThere''
* ''Anime/OccultAcademy''
* ''Anime/OkusamaWaMahouShoujo''
* ''{{Anime/Oreshura}}''
* ''Anime/PantyAndStockingWithGarterbelt'', though Creator/StudioGainax apparently has a second season planned, although it's very unlikely to happen as the series creator left Gainax to create Creator/StudioTrigger.
* ''Anime/ParallelTroubleAdventureDual'' has thirteen episodes, plus a special.
* ''Anime/ParanoiaAgent''
* ''Manga/{{Pretear}}''
* ''Anime/SandsOfDestruction''
* ''[[Manga/{{Saikano}} Saishuu Heiki Kanojo]]'' (''Saikano'' / ''She, the Ultimate Weapon'')
* ''Manga/SasamekiKoto''
* ''Anime/SerialExperimentsLain'', true to its indie nature, is a thirteen-episode series.
* ''Literature/ShinreiTanteiYakumo''
* ''Manga/ShouwaGenrokuRakugoShinjuu'', with the first being a retelling of the OVAs. The OVAs cover the first volume, while the anime goes from the first to the fifth volume.
* ''TheSilverBrumby'''s [[ShortRunner only season]] had 13 episodes.
* ''Anime/SpacePatrolLuluco'': Ran for 13 episodes during the Spring 2016 season, which were idiosyncratically divided into four "seasons" of three episodes each, plus "season final" consisting of just the 13th episode.
* ''LightNovel/SpiceAndWolf'' had [[BonusEpisode 13 episodes]], with the 7th episode being DVD-only. The second season had 12 episodes, with an epilogue to the last season as an [[BonusEpisode episode 0]] on DVD.
* ''Anime/StarshipOperators''
* ''Anime/StrainStrategicArmoredInfantry''
* ''Anime/{{Stratos 4}}'' has 13 episodes in its first season. Its second season has 6 episodes plus a 2-episode OVA, and there is another intermediary two-part OVA.
* ''VisualNovel/ToHeart''
** ''VisualNovel/ToHeart2'' as well, however, it has a three part OVA, and a two part OVA spinoff ''To Heart 2: Another Days'', which is loosely based on the GaidenGame spinoff of the same title.
* ''Manga/{{Tokko}}''
* ''Manga/TonaGura'' has 13 episodes with a semi-firm conclusion. That said, the manga is still ongoing, and whether or not this conclusion is used remains up in the air. Up until 2009, manga chapters tended to be fully fleshed, expanded versions of the anime episodes.
* ''VisualNovel/WhiteAlbum2''
* ''Anime/WindyTales''
* ''Manga/{{Working}}''
[[/folder]]

[[folder:Originally This, But Given More Seasons]]

* ''Anime/BirdyTheMighty Decode'' got 13 episodes; its second season got 12.
* ''LightNovel/BokuWaTomodachiGaSukunai'' started with 12 episodes in fall 2011, then got an additional 12 episodes in winter 2013.
* ''LightNovel/TheFamiliarOfZero'' started with 13 episodes, and now has three sequel seasons with 12 each.
* ''Manga/ICantUnderstandWhatMyHusbandIsSaying'' and it even [[LampshadeHanging lampshades]] how most anime only run for 12/13 episodes and Hajime admits he's always curious on how it goes on with the heroes after, during its own 13th Episode. Then [[http://www.animenewsnetwork.com/news/2014-12-25/i-cant-understand-what-my-husband-is-saying-anime-gets-2nd-season/.82612 the anime got a second season]] right after this episode.
* ''Manga/StrawberryMarshmallow''. Two OVA series, one with three episodes, the other with two, were made after the TV series, so there are now 17 episodes of Ichigo Mashimaro.
* ''Manga/{{Ikkitousen}}'''s first season. Its second season had only 12.
* ''LightNovel/InfiniteStratos'' has two 12-episode seasons, not counting the OVA.
* ''VisualNovel/KoihimeMusou''. All 3 seasons have 12 episodes.
* ''LightNovel/LoveChunibyoAndOtherDelusions''. (Both seasons contain 12 episodes plus an {{OVA}}. Given their plot importance, they could be seen as 13 ep. seasons.) [[note]]This also doesn't include the six per season ''Lite'' episodes which together equal another complete episode.[[/note]]
* ''LightNovel/MariaSamaGaMiteru'' has three 13-episode seasons.
* The initial run of ''[[LightNovel/HaruhiSuzumiya The Melancholy Of Haruhi Suzumiya]]'' got 14. The second season also has 14 episodes (a total run of 28, including the first season).
** One of the first season's episodes is the NonIndicativeFirstEpisode, which is a "movie" created by the SOS club rather than a normal episode.
** Also consider that 8 of 14 episodes in season two [[GroundhogDayLoop are generally the same]].
* ''LightNovel/{{Oreimo}}'' has twelve broadcast episodes in its first season and 13 in its second, plus four {{OVA}} episodes.
* ''Anime/SailorMoonCrystal'' has ran for three 13-episode seasons, each adapting an arc from the [[Manga/SailorMoon manga]].
* All three ''Manga/SayonaraZetsubouSensei'' seasons are 12-13 episodes long.
* ''Anime/{{Vandread}}'' first aired with 13 episodes, but managed to get a second 13 episodes and resolve the story. There's rumors of a third season, but aren't there always?
[[/folder]]

[[folder:Unusual Cases]]

* ''Manga/{{ARIA}}'' The ANIMATION and The ORIGINATION (Season One and Season Three) are both 13 Episodes in length whereas ARIA The NATURAL (Season Two) is 26 episodes long.
* ''Manga/AsagiriNoMiko'' has 26 episodes, but each is under a quarter of an hour long, half the "standard" episode length.
** The same goes for the ''Anime/GalaxyAngel'' anime.
** And ''Anime/SteelAngelKurumi''
** Same goes for ''Manga/CromartieHighSchool'', though they generally broadcast them in pairs.
** As well as ''Manga/RiskySafety'', but it has 24 episodes.
** ''VisualNovel/WWish'' and ''VisualNovel/FinalApproach'' each have 13 twelve-minute episodes, aired side-by-side during the "Princess Hour."
* ''Anime/AyakashiSamuraiHorrorTales'' is an unusual case; it's a 12-episode series and was aired as such on Japanese television, but is actually an anthology consisting of [[TelevisionSerial three separate 4-episode anime]] by completely different production groups. (The final series in the anthology, "Bakeneko", ended up with its own spinoff--''Mononoke'', also a 12-ep series.)
** ''Anime/BlueLiterature'' follows the same format, with five arcs adapted from Japanese literature.
* ''LightNovel/{{Bakemonogatari}}'' ran for 15 episodes long.
** ''Nisemonogatari'': 11 episodes
** ''Monogatari Series: Second Season'': 26 episodes
** ''Owarimonogatari'': 12 episodes
* ''Anime/Berserk2016'' was 12 episodes long for the first season, the second season was 9 episodes.
* ''Anime/BlackRockShooter'' is eight episodes long, and was aired in NoitaminA. If you count the OVA (which was released two years earlier and is in a separate continuity), then it had nine episodes in total.
* As mentioned in the main article, many live-action Western shows are adopting this, such as NBC's ''Series/{{Chuck}}''. During the 2007-2008 season, however, a lot of this was the unintentional result of that season's Writer's Strike.
* ''Manga/DGrayMan'' in its first TV broadcast from Oct. 2006 to Sept. 2008 had a whopping 103 episodes. The odd thing is that the show is considered to be 2 seasons of 51 and 52 episodes, even though there was no break in the airing schedule and it continuously aired until the end. Regardless, the manga went on hiatus for over 2.5 years before returning in July 2015. A continuation series called ''D. Gray Man: Hallow'' aired starting July 2016 and picked up where the first anime left off, but ''Hallow'' was only 13 episodes long.
* ''LightNovel/{{Durarara}}'' in its initial run had 24 episodes, divided into two halves and denoted by the different opening and closing credits sequences. For its second run, it had 36 episodes which were divided into three cours. Unlike the first run where both cours were broadcast back-to-back, the new cours were released separately - ''Shou'' was in Winter 2015, ''Ten'' was in Summer 2015, ''Ketsu'' was in Winter 2016)
* ''LightNovel/FateZero'''s first season has 13 episodes, but it's effectively 14 episodes, because the first episode is 45 minutes long. This was apparently done to get the [[InfoDump humongous amount of prologue exposition]] (for a show which is ''itself'' a prologue for [[VisualNovel/FateStayNight an entire franchise]]) out of the way in the first episode. The second season is a normal 12 episode season.
** ufotable's next ''Fate'' adaptation, ''Anime/FateStayNightUnlimitedBladeWorks'', is an even crazier case. The first season is 12 episodes, but it's actually ''16'' episodes long because there was a prologue "Episode 0" that was 45 minutes long, and Episodes 1 and 12 were '''[[UpToEleven also]]''' double-length episodes. The second season was 13 episodes, all standard length this time.
* ''Manga/FateKaleidLinerPrismaIllya'', a spinoff series of the above-mentioned ''Fate'' franchise, started its anime adaptation with a 10 episode season. Then the second season got split into two cours, each one 10 episodes long. The third season is 12 episodes long.
* ''Manga/{{Haikyuu}}'''s first two seasons were 25 episodes long each along with a 2 episode OVA. The third season is only 10 episodes long.
* ''Anime/{{Kamichu}}'' had 12 to start, with four DVD-only episodes interspersed between the broadcast episodes. (A ploy to get people to buy the [=DVDs=], as the DVD-only episodes are ''not'' strictly filler.)
* ''Manga/KOn'''s first two arcs are only twelve episodes, but the show ended with a special episode outside of the second arc. Then it skyrocketed in popularity, and the second season got 26 episodes.
* ''LightNovel/KokoroConnect'' has 13 episodes, but with 4 [=OVAs=] on the way in 2013, it's an amount of 17 episodes altogether.
* ''Anime/LittleBusters'' had a 26-episode first season covering Komari, Mio, Haruka, and Kud's routes along with most of the common route, and then a 13-episode second season covering Kurugaya's route, Rin's route, and Refrain.
* ''Anime/PrincessTutu'' was a VERY odd variation on this in its original TV broadcast. The first 13 episodes of the series were the standard 30 minutes each, but a time-slot change beginning with episode 14 lead to the running time being halved and the latter half of the series airing as 24 episodes of 15 minutes each - until the final episode, which was again 30 minutes long. Even more strange is that there was no gap in airing between the "seasons" - the 15-minute episode 14 aired the week after the full-length 13. Confused yet? The DVD release restored the split episodes into 30-minute ones, making it look like a 26-episode series to those who don't know its broadcast history. Of course, there were also the three TV specials produced...
* The first season of ''Manga/ShokugekiNoSoma'' was 24 episodes long. The second season, ''Ni no Sara'', was only 13 episodes long, much to the fanbase's irritation because the manga has plenty more content that could easily be adapted.
* The fourth season of ''LightNovel/{{Slayers}}'' ending up being split into two 13-episode seasons instead of one 26-episode season. Of course, Revolution leaves a lot of plot threads for Evolution-R to pick up, but season five did get a new OP and ED...
** This isn't too dissimilar to how previous series of Slayers played out: typically, TheDragon would be fought by Episode 13, and from episode 14 onwards, the focus would shift to TheManBehindTheMan or some other BigBad therein.
** It has, however, been packaged together in Japan and elsewhere, and is often referred to as [[FanNickname Revolution-R]] for simplicity's sake.
* ''Anime/SpaceDandy'' consists of two 13 episode seasons, although this had been planned out before it began airing, so it can also be considered a 26 episode series with a break in the middle. Nonetheless, it's still officially two seasons.
* ''WesternAnimation/TheLegendOfKorra'' was going to be the WesternAnimation version of this. ''Was'' being the keyword because it quickly got picked up for a second season of fourteen episodes, and then later another twenty-six episodes. On the other hand, the first season was still similar, being very self-contained.
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%comment% Please don't just place new examples here at the bottom -- find the appropriate section and add your examples there, alphabetically for easy indexing. Thanks. :)

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