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7%% Quote changed per thread: https://tvtropes.org/pmwiki/editpost.php?postid=1327331003042025100
8
9->'''Kaiko Mikuniyama:''' The elegant little sisters should be wearing underwear worthy for girlfriends!\
10'''Itsuki Hashima:''' You fool! [...] Saying that a filthy little piece of cloth should hinder the holy nude body of a little sister is outrageous! Little sisters are the most beautiful when they are in their natural state.
11-->-- ''Literature/ASistersAllYouNeed''
12
13The Little Sister Heroine is a trope common in -- usually but not always Japanese -- media that combines the idea that little sisters are cute and that cute things are to be fetishized. It goes like this:
14
15Little sisters are cute, right? And cute girls draw in viewers. And cute can be sexy. Take a few more logical steps down the line, and suddenly little sisters are love interests in anime, video games, and visual novels. It is in fact one of ''the'' most popular types of heroine or love interest in VisualNovels, branching out from there into anime, perhaps surpassed only by the ever-present ''{{tsundere}}'' and childhood friend. Like the similarly ubiquitous ChildhoodFriendRomance, it is extremely prone to {{lampshade hanging}}s.
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17As a LoveInterest trope based on the little sister/older brother dynamic, the story will usually dwell on the romantic tension between them. Despite the name, Little Sister Heroine attempts to mitigate the obvious incestuous fallout; [[NotBloodSiblings they're usually either a step-sister, adopted]] or, more rarely, [[KissingCousins technically a cousin or distant relation]]. In almost all cases, the younger sister is going to be either some degree of ''tsundere'', childish and clingy, or simply [[BigBrotherWorship highly devoted to their older brother]]. Finally, the relationship between the two will likely be noticed or exaggerated by the rest of the cast. If you don't notice at least several of these general characteristics, it's probably not this trope.
18
19If the relationship remains incestuous, the sister usually completely takes the initiative, in order to allow the author to save the main character from the moral responsibility and use thematic {{fanservice}} in the work. Thus, in the majority of plots concentrating on the incestuous relationship with the little sister, the sister takes an active role throughout the story in seducing her brother, while "protecting" him from all the other girls. If we are talking about siblings with little difference in age or HalfIdenticalTwins, then her childish traits tend to be less pronounced, tending toward greater borrowing from ChildhoodFriendRomance tropes.
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21In this regard, it should also be noted that--similar to other such plots--the main character and his sister will in most cases be represented as a kind of duet, as a result of which the other cast members will mistakenly take them for twins, even in the absence of kinship or the presence of a difference in age. However, this trope works only if the little sister-ness is central in this work.
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23It may include elements of him needing to protect her, a fear that someone else might hurt her or break her heart, or that other guys just aren't good enough for her. It is also related to the idea that this sibling is theirs, and they don't want someone else to "steal" them. In this regard, a great many little sister heroines feel aversion to all other men than their brother, in order to emphasize their devotion to him. In other cases, it may also mean that an outsider guy can become a couple with the little sister only if he can be equal to or better than her brother, which is often used for [[AuthorsSavingThrow harmless resolution]] [[IncestSubtext romantic tension]] between brother and sister.
24
25It rarely works like this in real life. Those who have younger sisters themselves and hear about this trope often claim that they're [[AnnoyingYoungerSibling annoying]] rather than cute, making this trope more wish fulfillment than anything like an accurate portrayal of sibling dynamics.
26
27Also known in some circles as an ''imouto'' heroine. Accordingly, the works having an imouto as main romantic interest, marked as Imouto-titles.
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29Note that BrotherSisterIncest is not exclusive to Asian media, but that when it is portrayed in Western media it tends to be [[CreepyTwins between twins]] or the woman will be the older sibling. Western media sometimes doesn't bother to minimize the IncestSubtext, though if it does the excuse will usually be that one of the siblings is not actually human (or neither of them is).
30If it's framed more from the point of view of the younger sister who likes the older brother, it's BigBrotherAttraction, although both can occur simultaneously. See also BrotherSisterIncest, FlirtyStepsiblings, BigBrotherMentor, BigBrotherInstinct, and sometimes NotBloodRelated.
31
32----
33!!Examples:
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35[[foldercontrol]]
36
37[[folder:Anime & Manga]]
38* Invoked in ''Manga/BlendS'', where Mafuyu is hired by [[OccidentalOtaku Dino]] to play this archetype in [[CosplayCafe Café Stile]]; when waiting tables, she acts like a cute, cheerful little girl who addresses customers as "Onii-chan". However, she's actually a 20-year-old college student who's [[OlderThanTheyLook older than she looks]], and her real personality is that of a DeadpanSnarker who can be [[BrutalHonesty brutally honest]].
39* ''Something'' of this is between [[GuileHero Lelouch]] and Nunnally in ''Anime/CodeGeass''. Nunnally hits a lot of the check points -- young, cute, DamselInDistress, [[BigBrotherWorship adores]] her older brother who is ''very'' protective of her (he just started a '''damn war''' to protect her that's all) -- but isn't certainly his love interest, falling under the NotLoveInterest in importance. That said, they have IncestSubtext moments and a lot of extra materials [[LampshadeHanging lampshade]] how ambiguous their relationship is due to their devotion to each other. PlayedForLaughs as a general rule, but it's worthwhile noting they ''are'' royalty and royalty has a long tradition of incest. Extra materials also reveal [[spoiler: their own ''mother'' wanted to play this straight between them. Ick.]] It doesn't help that in one of the mobile games, an event ran where Lelouch met clone children from the future--and one of his four kids was a clone made from him and Nunally (the rest were derived from his love interests C.C. and Kallen, plus [[HomoeroticSubtext one of him and Suzaku]]).
40** Played ''slightly'' more straight between Lelouch and his half-sister [[AllLovingHero Euphemia]]. Lelouch fully admits she was the first woman he loved and when she was younger Euphie wanted to marry him, not to mention in the present still shows signs of attraction to him. Euphie has an entirely different love interest in [[AcePilot Suzaku]] however and [[spoiler: Lelouch is forced to MercyKill her after a horrible mistake.]]
41* ''Manga/ACoupleOfCuckoos'' has Sachi Umino, protagonist Nagi's little sister. She didn't start seeing him as a man until she learned that they're NotBloodSiblings after all since Nagi is adopted, but Nagi himself has trouble not seeing her as a little sister.
42* {{Parodied|Trope}} with the 4koma manga ''Manga/CyclopsShoujoSaipu'' which plays everything straight... except the [[BigLittleBrother "little" sister]] is a [[HugeSchoolgirl 180 cm (5 ft 11 inches) tall middle schooler]] with huge boobs, and the older brother is [[OneHeadTaller one head shorter]] at [[TinyGuyHugeGirl 165 cm (5 ft 5 inches)]].
43* ''Manga/{{Genshiken}}'''s club of otaku, very aware of these tropes, [[DiscussedTrope raises the possibility]] when they find out newcomer Kanji has a younger sister. It is then [[DefiedTrope shot down]] when he says that only those ''without'' younger siblings could fetishize them so.
44* ''Manga/{{Ibitsu}}'': The Strange Lolita is a very twisted, PlayedForHorror invoking of the trope. She asks random men if they have a little sister, and no matter how they answer, will insert herself as their little sister. She does this by stalking them, tormenting them, and killing everyone they love, including actual little sisters, while [[{{Yandere}} declaring her love for her Onii-chan]].
45* Nao from ''Manga/IDontLikeYouAtAllBigBrother'', whose life goal is to hook up with her adopted brother Shuusuke.
46* Chino in ''Manga/IsTheOrderARabbit'' is being seen by many of the cast as one, to her annoyance.
47* ''Manga/KoiKaze'' explores how something like this might actually happen in real life. The brother and sister in the story haven't seen each other in over ten years - when the sister was just a toddler - and as such don't recognize each other at first. The brother, Koshiro, near instantly falls in love ([[InconvenientAttraction causing him a great deal of distress when he discovers their blood relationship]]) while the sister, Nanoka, at first is doting on her newly reconnected older brother, only to later discover that her feelings have deepened into romantic love. Koshiro's colleague Chidori notes the odd atmosphere surrounding the two when Nanoka visits Koshiro at his job.
48* Implied/parodied in ''[[Manga/HaruhiChan The Melancholy of Haruhi-chan Suzumiya]]'' where in the final episode Yuki makes a romantic Visual Novel with Kyon as the player character and with 10 heroines, one of which is Kyon's little sister.
49* Inverted in ''Manga/OneechanGaKita'' where the main heroine is the protagonist's older [[NotBloodSiblings step-sister]].
50* Repeatedly commented on and averted in ''Manga/ShinozakisanKiWoOtaShikaNi''. Akina thinks her brother Makoto is disgusting. Makoto, for his part, has no interest in Akina and is seriously weirded out by how so many people keep bringing this trope up.
51* ''Manga/SketDance'' have Saya, a redheaded {{tsundere}} with large breasts and [[GirlishPigtails twintails]]. Bossun and Switch remarked that she looks exactly like a Visual Novel character, and is only missing the "little sister element". Turns out she ''is'' actually the younger sister of another recurring character, i.e. student council president Agata.
52* ''Literature/TrappedInADatingSimOtomeGamesAreToughForUsToo'': An AlternateTimeline spinoff where the protagonist Leon's [[ReincarnationRomance past-life]] sister Marie is PromotedToLoveInterest. Marie was always presented as a HateSink of AnnoyingYoungerSibling sisters by the author who ended up UnintentionallySympathetic due to her excessively harsh lives; in fact, the original timeline version of Marie is a major subversion. Marie is a CuteBruiser who starts off as a GoldDigger HaremSeeker and undergoes substantial CharacterDevelopment.
53* ''Manga/TheWorldGodOnlyKnows'' has Keima absolutely refuse to acknowledge that Elsie is a proper little sister because she doesn't match the template from his beloved gal games. Eventually, however, he decides to acknowledge her, but only because he wants to get their contract completed quickly. As time goes on, [[spoiler:she eventually really does become his little sister, moving away from this trope in the process]].
54* ''VisualNovel/YosugaNoSora'' has Sora, the main character's twin little sister. She has very strong feelings for her brother, going as far as thinking of him during... certain private times.
55** A [[JustifiedTrope justification]] is attempted by showing, in a flashback, that Sora spent most of her childhood hospitalized, and so Sora and Haruka didn't spend enough time together for the Westermarck effect to kick in. Why Haruka was kept away from his sister for so long is never explained.
56[[/folder]]
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58[[folder:Literature]]
59* [[NiceGirl Enju Ahiara]] from ''Literature/BlackBullet'' is seen as this from [[TheHero Rentaro]]'s perspective. [[spoiler:This can be a deconstruction of this trope, as Enju's PrecociousCrush moments not only serves as [[AnnoyingYoungerSibling an annoyance]] to Rentaro, but Enju's high corrosion rate and the fact that she's slowly turning into a Gastrea serves as an emotional burden to him.]]
60* ''Literature/BrothersConflict'' has this as its premise, with all of the stepbrothers going after the little sister from the point of view of the "Little Sister" herself. The series also has a RareMaleExample in Wataru, the TokenMiniMoe and [[TheCutie Cutie]].
61* In ''Literature/DateALive'', Kotori Itsuka is a parody of this when first introduced. Her [[NotBloodSiblings foster brother]] Shido (and others) even [[LampShadeHanging call]] her his [[PhraseCatcher "cute little sister"]]. It then gets [[SubvertedTrope subverted]] when we meet her [[SplitPersonality other personality]]. The romantic subtext is unclear. She is implied to have some not-quite-sisterly feelings for her brother but doesn't have a problem [[PlayingCyrano setting him up]] with the GirlOfTheWeek (ItMakesSenseInContext). The only time she goes into ClingyJealousGirl mode is when she meets [[spoiler:his [[LongLostRelative biological sister]], Mana]], at which point she reveals the level of her interest in him by [[spoiler:arguing about who's better and finally declaring that not having any real relation is better because a real sister couldn't ever marry him.]]
62* Parodied in ''Literature/{{Dokkoida}}'', where the main character lives with an alien girl masquerading as his little sister. Thanks to a soap opera episode following this trope, she and the majority of their neighbors (who are also aliens) become convinced that it applies to the main character as well, thanks in part to DirtyOldMan [[MadScientist Dr. Marronflower]] using his own library of H-games as evidence. HilarityEnsues when the two who have a crush on the hero attempt to [[InvokedTrope invoke]] it to their advantage, leaving him completely confused.
63* ''Literature/TheGardenOfSinners'' has Kokutou's little sister Azaka. She has an inherent interest and draw towards things that are taboo, so she develops an incestuous crush on her brother. Azaka is the template for Akiha in ''VisualNovel/{{Tsukihime}}''.
64* Miyuki Shiba from ''Literature/TheIrregularAtMagicHighSchool'' can be seen as an example of the collection of all the clichés of such heroines and as well as an example of a rather original attempt to play with them. On the one hand, she idolizes her brother and declares willingness to do whatever he wants with her. On the other hand, her "silly little sister" behavior is only a mask to deceive her brother and convince him of the need to continue to take care of her. Later, [[spoiler: it turns out that as she was artificially created and genetically improved, she can have a healthy family with her brother while continuing to be his biological sister and having the same parents as him.]]
65* Kureha of ''Literature/MayoChiki'' is a member of Jirou's [[UnwantedHarem Unwanted]] and SupportingHarem. Observe her reaction upon finding that Jirou, who has gynophobia[[note]]That is, having a bad physical reaction to even being touched by women, which is largely Kureha's fault in the first place because of her [[HilariouslyAbusiveChildhood treatment of him]][[/note]] may have a girl over at the house. It's not ignoring something that's none of her business, or happiness that her brother has finally gotten over the condition that has crippled his social life, but rather to kick down doors and scream:
66-->'''Kureha:''' Who's been swindling my brother!?
67* The entire premise of ''Literature/MySisterMyWriter'' is themed around this trope; the main heroine, Suzuka is in love with her older brother Yuu, and the light novel she writes that becomes an overnight success is about this kind of heroine. The trope itself is discussed more than once.
68* Taken to a whole new (hilarious) level in ''[[Literature/{{Bakemonogatari}} Nisemonogatari]]'' with Araragi's little sisters, Karen and Tsukihi. [[IncestSubtext That infamous toothbrushing scene]].
69* The premise of ''Literature/{{Oreimo}}'' is largely based around this trope. Kirino plays games with this trope as their focus and is the tsundere type herself. The relationship between her and her older brother Kyousuke is probably the biggest focus of the series.
70* An interesting case shows up in ''Literature/ASistersAllYouNeed''. The main character's sister isn't one, but his father assumes that he's a significant threat to her because of the MC's incredibly unhealthy obsession with younger sisters in fiction. As such, he forces her to present as male around her brother out of fear of what he'd do to her if he knew she's actually his sister. Furthermore, [[spoiler:when he ''does'' eventually find out that his sister is a girl, he goes into a funk so wide he takes a hiatus from writing; since he refuses to see his sister like an imouto heroine, he recontextualized his obsession and found the whole practice gross.]] However, there ''is'' a younger sister that invokes the trope, but she is constantly rebuffed until [[spoiler:she threatens her brother with her own suicide if he doesn't stay by her forever]].
71* Viserys Targaryen in ''Literature/ASongOfIceAndFire'' has raised and protected his beautiful little sister all her life. By their family's traditions, he should've married her, had circumstances been better. When it's time to marry her off to someone else, even though he decides to do it, he barely goes through with it. The little sister in question is reasonably aware of all this, and not cool with it.
72* Suguha/Leafa in ''Literature/SwordArtOnline'' is actually Kirito's cousin, but otherwise fits the trope to a T, as they were raised together as siblings by her parents and she harbors a BigBrotherAttraction towards him. She grows out of it by the end of the ''Fairy Dance'' arc, though.
73[[/folder]]
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75[[folder:Live-Action TV]]
76* River from ''Series/{{Firefly}}'' is somewhat of a Western example. She's a very disturbed SuperSoldier who [[BigBrotherWorship absolutely adores her older brother Simon]]. She sometimes goes to his bed when upset or sick, and in a DeletedScene [[FatherIWantToMarryMyBrother asked Book to marry her to Simon and pretended to be pregnant to "justify" it]]. And then there's the end of ''Film/{{Serenity}}''.
77%%* If this [[http://www.gramunion.com/eliaspsuedo.tumblr.com/145801153413 image]] from ''Series/KamenRiderGhost'' is anything to go by, the secondary rider has some suppressed feelings for his younger sister.
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80[[folder:Video Games]]
81* ''VideoGame/ArTonelicoIIMelodyOfMetafalica'': Cocona is [[NotBloodSiblings Croix's adoptive sister]] and very cute. She confides in Cloche that she is in love with him but his only love is as a brother because of their age difference, though if you don't secure any of the other three endings you default to her. The sequel suggests that this is the true ending, however.
82* ''VideoGame/BlazBlue'':
83** Kind of a ZigZaggedTrope with Noel Vermilion because she's not actually [[TheProtagonist Ragna's]] little sister but rather a clone of her. Everything else about the trope is played straight. It's ''heavily'' implied she has a crush on him, and even if she doesn't, she looks up to him like an actual older brother and the normally withdrawn and antisocial Ragna is ''fiercely'' protective of her. Their relationship is a major focus of the series at that.
84** In a more explicit and ''much'' darker example of this trope, there is v-13, another clone of Ragna's little sister who, as a [[PersonOfMassDestruction Murakumo Unit]], serves as one half of Ragna's titular, incomplete ArtifactOfDoom. Said Artifact actively tries to become whole, with the Murakumo Unit's programming compelling v-13 to get as close to Ragna as possible. This appears to be interpreted by v-13 as "attempt to get into Ragna's pants" judging by how most of her dialogue with him is peppered with {{Double Entendre}}s and innuendos and their fights are showcases of InterplayOfSexAndViolence. Ragna is ''not'' thrilled... A lot of the plot revolves around Ragna and v-13's relationship, Ragna's attempts at saving v-13, her inability to comprehend and appreciate their relationship beyond anything but this MasochismTango they've got going on, and both's absolute hatred of [[CrapsackWorld the world]] and what they choose to do with that hatred.
85** Then there's Hades Izanami, a goddess of death who uses the body of Saya, Ragna's actual little sister, as a medium. Though Izanami herself has scant interest in Ragna, she reveals that [[HumanityIsInfectious Saya's love for him is infectious]] and pushes her to reach out to him. This largely comes off as Izanami coming on to Ragna ''really, really strongly.'' It's not entirely clear if Izanami's behaviour is an accurate representation of Saya's feelings for her "dear onii-sama", or if Izanami is twisting Saya's feelings into something obscene just to mess with Ragna, or if human emotions are just so alien to Izanami that she genuinely doesn't know how to express love without sexualizing it.
86** Complicating matters is the fact that both Noel and Izanami[=/=]Saya contain two halves of The Origin's soul. The Origin is a young Murakumo Unit from a previous universe who was installed into the [[DeusEstMachina Master Unit: Amaterasu]]. After destroying her old universe and dreaming a new one into existence, The Origin created a "central fiction", a lynchpin that the whole universe revolves around, in much the same way a work of fiction revolves around its central main protagonist. Said "central fiction" was Ragna who The Origin dreamed into existence as a Big Brother[=/=]{{Knight in Shining Armour}} figure meant to free her from her imprisonment within the Amaterasu Unit.
87* ''VideoGame/TheCoffinOfAndyAndLeyley'' plays this for drama. Andrew Graves' little sister, Ashley Graves, is utterly obsessed with him to the point where she's frequently come bewteen his crushes and girlfriends. Thanks to their broken home, Ashley and Andrew become codependent, which leads to a slew of bad decisions after they've been locked inside of their apartment building.
88* ''VideoGame/DarkSoulsI'' plays with this trope in a very dark way: after slaying the evil Chaos Witch Quelaag in her lair, the [[PlayerCharacter Chosen Undead]] discovers that she was taking care of her blind, crippled little sister, referred only as "the Fair Lady" by their servants. Since the Fair Lady is blind and the Chosen Undead is a HeroicMime, she mistakes you for her sister (whom she adores), and you can then join their Covenant, whose sole purpose is to [[VideoGameCaringPotential procure means to (slightly) ease her suffering]], which is what Quelaag was trying to do when you murdered her. While there is no romantic subplot (mainly because the Fair Lady is in constant pain and is also [[SpiderPeople a giant spider from her waist down]]), there is most definitely a LadyAndKnight dynamic going on.
89* Parodied with [[https://static.tvtropes.org/pmwiki/pub/images/Desco_2_7948.png Desco]] in ''VideoGame/Disgaea4APromiseUnforgotten''. Desco was created specifically to fulfill [[spoiler:Fuka]]'s childhood wish for a little sister, and as such was implanted with all of the classic traits of a Little Sister Heroine. However, since [[spoiler:Fuka]] is an eccentric individual who wished for [[spoiler:her]] Little Sister Heroine to come with "advanced functioning to help me take over the world," Desco was ''also'' created with {{Lovecraftian Superpower}}s and a compulsion for complete annihilation. The result is the world's most AdorableAbomination.
90** ''VideoGame/DisgaeaDimension2'' gives us a straighter example with Sicily, Laharl's LongLostSibling. While she naturally plays the trope straight, she tries to really invoke it for all it's worth by playing up her cuteness and offering sweets to convince Laharl to give up the title of Overlord. It only serves to further piss him off.
91* A non-Japanese example from a [[Creator/BioWare Western developer that likes playing with JRPG tropes]]: Bethany Hawke from ''VideoGame/DragonAgeII'' hits almost every note of this trope. Young, cute, needs rescuing from time to time, and adores her [[PlayerCharacter older sibling]]. The only thing missing is the ability to actually romance her.
92* Mia in ''VideoGame/DuelSaviorDestiny'' is definitely the ClingyJealousGirl type with some level of tsuntsun going on. Her actual degree of relation to Taiga gets retconned, though. In the epilogue of her route, it's hastily claimed that it sure is convenient that they're not related. In the final route, it turns out they actually do share a blood relation and are probably half-siblings.
93* In ''VideoGame/FireEmblemFates'', [[ShrinkingViolet Princess Sakura of Hoshido]] and [[GenkiGirl Princess Elise of Nohr]] follow the archetype. Each girl is the youngest of the local Royal Families (Sakura is the Avatar's blood-related sister [[spoiler: [[NotBloodsiblings (only not)]] ]] while Elise is the adoptive sister kind), both adore the Avatar in her own ways, and both will be '''heartbroken''' if the Avatar doesn't join the side she supports.
94* Another non-Japanese example: Luxanna Crownguard AKA Lux from ''VideoGame/LeagueOfLegends''. She is the little sister of Garen, a distant one, and a CuteWitch that serves the nation of Demacia well, just like her big bro. And while she certainly has some things to call out on him, she clearly respects him a lot.
95* ''Men at Work 2'' has Mena as a possible love interest, though not the main one.
96* ''VideoGame/Persona4'' has TheProtagonist's cousin Nanako Doujima, who refers to him as "Big Bro" ''and'' [[KissingCousins gains a]] PrecociousCrush on him at the end of her social link. Nothing gets made of it, unless the player also maxes out her father's social link, in which case his only protest is that Nanako is still too young.
97* ''VideoGame/TrailsSeries'', starting with the ''Cold Steel'' series, has Elise, Rean's adoptive younger sister. She has a crush on Rean, who in turn is [[BigBrotherInstinct overprotective]] of her. Starting with ''CSIII'' she's treated as a potential love interest, and confesses to Rean in her final bonding event in ''CSIV''.
98* ''VideoGame/YandereSimulator'' is an {{Animesque}} game that uses a ton of HaremAnime tropes. Therefore, it's not surprising that there's a rival that happens to be your Senpai's younger sister. However, [[NotLoveInterest she's not actually interested in them that way]]; she's clingy, and at the end of her week she'll convince them to not have a girlfriend for her sake. She's no less a threat for our {{Yandere}} VillainProtagonist, though, so she'll have to be dealt with.
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101[[folder:Visual Novels]]
102* ''VisualNovel/AseliaTheEternalTheSpiritOfEternitySword'' has Kaori, but in the end, she turns out to be more of a LivingMacGuffin than a heroine and does not even have a proper ending. Yuuto is frequently accused of being a siscon due to his overprotective nature, but in the end, it turns out to work in reverse due to her unrequited affections.
103* ''VisualNovel/Canvas2'' has Ellis, though she's actually his cousin. She tends to be extremely clingy and childish.
104* ''VisualNovel/ChaosHead'' has Takumi and his little sister, Nanami. The way the game works means that as with the other female main characters, you can trigger certain 'delusion' events about her that occur only in Takumi's head, but that he doesn't control. Or something. [[spoiler:Though it turns out that he's not Takumi, exactly. [[MindScrew It's complicated.]]]]
105* Inverted in ''VisualNovel/CrescendoJP'', where the ''older sister'' (Ayame Sasaki) is the one who gets the path. And yes, she's very pretty too.
106* Nemu in ''VisualNovel/DaCapo'', where she's even the main heroine. In a rare case of not being completely ObliviousToLove, Junichi is in fact perfectly aware of how she feels but isn't quite comfortable with a relationship upgrade. Nemu is quite the tsundere and very clingy.
107* ''VisualNovel/DaCapoII'' actually has two adoptive sister figures, but the one who plays it up more is Yume, who is younger than Yoshiyuki. Yume, a clear Nemu expy, is in general less clingy. Everyone at their school seems to be jealous of Yoshiyuki having such a cute little sister despite his frequent claims that there's nothing between them.
108* ''VisualNovel/TheDevilOnGString'' has Kanon. Not only is she a heroine, but Kyousuke appears to be the only person she actually trusts. Kyousuke himself lampshades the romantic overtones of the trope but doesn't appear to take it seriously until she confronts him about it halfway through the main storyline, at which point her own miniroute splits off.
109* In ''VisualNovel/FamilyProject'', Matsuri eventually moves in to a little sister position for Tsukasa, even adopting the UsefulNotes/JapaneseSiblingTerminology. Her route, however, tends to focus on the fact that she's ''far'' younger than he is.
110* The HGame ''Imouto Paradise'' and its two sequels have a ThemedHarem of no less than '''five''' little sisters, all of them different but adorable all the same.
111* ''VisualNovel/KanaLittleSister'' has the main character's terminally ill little sister as the main heroine. The VN itself is possibly the TropeCodifier for this kind of relationship.
112* ''VisualNovel/KaraNoShoujo'' has Yukari, but despite the BrotherSisterIncest all over the story, you cannot sleep with her. The very idea clearly would not occur to Reiji.
113** She does have a topless CG though.
114* Franchise/{{Nasuverse}}:
115** ''VisualNovel/FateHollowAtaraxia'' as a general sequel to ''VisualNovel/FateStayNight'' that contains all of its continuity has open acknowledgement of [[spoiler:Ilya]] as [[spoiler:Shirou]]’s little sister, a relationship set up in several endings. And she really exploits it too: She's clingy to the point of nearly picking up her former {{yandere}} traits and tends to act her apparent age rather than her real age. She still gets no adult scenes, though, despite being the closest thing the series has to a fourth heroine. Also, worth pointing out the two [[NotBloodSiblings aren't actually related]]. [[spoiler:Shirou]] was adopted. [[spoiler: [[OlderThanSheLooks She's also not really his little sister either, she's actually older than him.]]]] It's more invoked than anything.
116** Akiha in ''VisualNovel/{{Tsukihime}}'' is largely written around this. Unfortunately for her, except for in her own ending this means she never graduates from 'little sister', even in sequels and expanded universe material. A definite tsundere type, she's even called Imouto (Little Sister) by Arcueid rather than her actual name.
117* Lampshaded with Rizu in ''VisualNovel/AProfile''.
118-->'''Masayuki:''' I'm not marrying you. I want to make sure you don't fall for me or anything. We're only stepsiblings, so I thought I should make that clear.
119* ''VisualNovel/{{Suika}}'' subverts the general trend of the little sister being a heroine when [[spoiler:Akane stabs her stepbrother to death should he choose her. She's actually in love with his fiancée, so choosing her means that Akane feels that it's okay to take his place and brainwashes his fiancée accordingly]].
120* ''Yume Miru Kusuri'' has Aya, but her route was cut. It is strongly implied that she fell in love with Kouhei because he was always subtly out of place in their home, making it difficult for her to see him as her brother.
121** Like the ''Manga/TheWorldGodOnlyKnows'' example above, Kouhei appears to be frustrated with her at one point for not being anything like the little sisters in H-games. "You're supposed to call me ''onii-san!"'' Aya is appropriately confused.
122[[/folder]]
123
124[[folder:Web Animation]]
125* ''WebAnimation/GrimReaperFlagChan'': The episode ''[[https://www.youtube.com/watch?v=gDaGOumjoJc What If You Had A Little Sister?]]'' has Grim Reaper Flag-chan turn into one by way of Romance Flag waving a "Onii-chan Wand". While Mobuo enjoys it at first, it turns out [[spoiler:it was temporary, restoring Grim Reaper back to her senses. When she saw Romance recorded the whole thing, she smacks Mobuo's head with the blunt end of her scythe to make him forget what happened.]]
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127
128[[folder:Real Life]]
129* In the closing stages of UsefulNotes/WorldWarTwo, UsefulNotes/ImperialJapan created the Chiran [[YamatoNadeshiko Nadeshiko]] (Ladies of Chiran) Units. A bunch of middle-school and high school girls served as surrogate "little sisters," providing housekeeping and company for transient pilots at Chiran Airbase in Kagoshima Prefecture, during the brief periods between their arrival from training bases elsewhere and their departure on their fatal missions. The unit was highly publicized at the time and may even be the TropeCodifier... but growing close to so many young men (some being almost the same age as them!) that were sent off to die in "Kamikaze" attacks [[BreakTheCutie took its toll on the girls]], so the project was ultimately pulled under the "HarmfulToMinors" label. Their story can be found in books like ''BLOSSOMS IN THE WIND: Human Legacies of the Kamikaze'', by M.G. Sheftall., or ''[[http://www.kamikazeimages.net/books/japanese/sato/index.htm Tokkou no Machi: Chiran]]'' by Sanae Satou.
130[[/folder]]

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