http://static.tvtropes.org/pmwiki/pub/images/rsz_onii-chan-no-koto-nanka-zenzen-suki-janain-dakara-ne_4179.jpg

Nao Takanashi is an ordinary junior high school girl who -- [[NonIndicativeName title notwithstanding]] -- [[BigBrotherAttraction really likes]] her older brother Shuusuke (though he is unaware of this), who turns out to feel the same for her, but manages to hold himself back out of respect for their relationship.

One day, whilst purging her brother's PornStash of anything not related to BrotherSisterIncest, Nao comes upon a family photo album full of childhood photos of Shuusuke and a girl in [[GirlishPigtails pigtails]], but without her. When she confronts her parents, they tell her the truth: ten years prior, their close friends perished in a car accident, leaving Nao, their daughter, the sole (albeit amnesiac) survivor. But instead of angsting over the fact that she and Shuusuke are NotBloodSiblings, she's ''elated'' that she can finally pursue a full-fledged relationship with him. However, a blonde girl in [[GirlishPigtails pigtails]] appears shortly thereafter... and all hell breaks loose.

''Oniichan no Koto Nanka Zenzen Suki ja Nai Dakara ne!!'', official English title ''I don't like you at all, Big Brother!!'' is a romantic comedy manga by Kusano Kouichi that started in 2008 with an anime adaptation for the Winter2011Anime block.
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!!This anime/manga provides examples of:
* ACupAngst: Nao, when she notices the bust size of [[ThoseTwoGirls Hirorin, Haruka]] and Kondou.
* ADateWithRosiePalms: According to [[StalkerWithACrush Iroha]], Shuusuke uses his left hand, and five times a day on average.
* ADayInTheLimeLight: Episode 7 focuses on the AGE explorers, rather than just Shuusuke.
* AllMenArePerverts:
** The members of the AGE (All Genre Ero), as well as Shuusuke's father.
** [[GenderInvertedTrope On the female side]], we have Nao and Iroha.
* AllWomenAreDomsAllMenAreSubs: Shuusuke and his father.
* AlwaysInClassOne: Averted.
* AnimalMotif: Baby penguin versus Cat.
* BeachEpisode: Early on, of course. Chapter 3[=/=]Episode 4.
* {{Bishonen}}: Captain Kirishima of the AGE.
* {{Blackmail}}: Kondou threatens Shuusuke with telling Nao of his PornStash after he rips off her yaoi magazines. Then again, that's a moot point, considering the kind of girl [[StalkerWithACrush Nao]] is.
* BlankWhiteEyes: All over the place.
* BlondeBrunetteRedhead: Iroha, Kondou, and Nao, respectively.
* BlueWithShock
* BrotherSisterIncest: Nao and Shuusuke, natch. Justifiable, since they're NotBloodSiblings, and [[TruthInTelevision Japanese laws allow for marriage between siblings by adoption]].
* ButtMonkey: Shuusuke just can't catch a break
* CaughtWithYourPantsDown: Shuusuke was completely nonplussed when Iroha told him how much he masturbates ([[AllMenArePerverts five times a day!]]), down to which hand he uses. It turned out she snooped him through a telescope.
* CensorBox: A baby penguin for Nao, as well as a cat for Iroha (both of which become their AnimalMotifs). Strangely, like in Rosario+Vampire the censor boxes seem to be used almost entirely at random, which is especially strange considering that Nao provides an extreme close-up, uncensored PantyShot in the opening of every episode.
* CherylBlossom: Kondou.
* ChildhoodMarriagePromise: Iroha gets this from Shuusuke in exchange for [[spoiler:PlayingDoctor with him]]. Shuusuke didn't think she was serious.
* ClassRepresentative: Kondou.
* ClingyJealousGirl: Iroha fits this to a T. Nao is this especially towards to the former.
* ColorFailure
* CPRCleanPrettyReliable: Unfortunately for Shuusuke it wasn't a girl.
* CurtainsMatchTheWindow: Most everyone except Kondou and Iroha.
* DatePeepers: Nao does this during Shuusuke's date with Iroha; and later ThoseTwoGirls peep on them. Taken to [[HilarityEnsues hilarious]] [[UpToEleven extremes]] in episode 3 of the anime when [[AllMenArePerverts the AGE group]] shows up and spies on them, too.
* DissonantSerenity: Put Nao and Iroha in the same room together.
** Add Kondou and it gets even worse.
* DoubleStandardRapeFemaleOnMale: Averted -- Shuusuke is rather traumatized when he's forcibly french-kissed and molested by Iroha.
* EnemyMine: Nao and Iroha team up once Kondou starts commanding most of Shuusuke's attention
* EroticEating: Episode 9.
* FanDisservice: Unless you're into BL/yaoi scenes.
* {{Fanservice}}: quite a lot, especially from Nao.
* FestivalEpisode: Episode 9.
* FirstEpisodeSpoiler: [[NotBloodSiblings Nao is adopted]] and is the sole survivor of a car crash that killed her parents, who happen to be Shuusuke's parents' friends.
* FourthWallPortrait: a variation. [[PsychoLesbian Kuro-neesan]] insists that Nao has "wonderful lips". We'll have to take her word for it.
* FunnyBackgroundEvent: In episode 10 it has Mr. X/Kondou running to the store and back.
* GirlishPigtails: Iroha
* GodivaHair: Rin
* GratuitousEnglish: In the second episode: Kurosaki tells Shusuke to "Come and Join Us"
** And Shuusuke replies with "Let's begin."
** The OP is filled with very strange, hard-to-hear examples. "It's not vice!" "Please teach me sweet sunshine kiss!"
* HaremSeries
* HartmanHips: Drawing style permits this. Especially Nao.
* HeroicBSOD: In Chapter 2, Nao has one (at first) when she finds out that her and Onii-chan are NotBloodRelated.
* {{Hypocrite}}: Nao and Iroha both accuses each other of this.
** Nao was puzzled by Yamashiro's little stepsister fetish.
* IdiotHair: Nao sports it.
* LaserGuidedKarma: [[spoiler:Rin]] stalks Nao, and later [[ForcefulKiss forcefully kisses]] Iroha and then abducts her.
* LeaningOnTheFourthWall: The conversation in the anime/manga shop in Episode 7 could easily be about the show itself and its presumed audience.
* LikesOlderWomen: Kurosaki of the AGE.
* LittleSisterHeroine: Nao
* LoveMakesYouCrazy: Iroha
* {{Meganekko}}: Iroha, when she's not sporting her [[GirlishPigtails twintails]].
* MistakenForGay: Well, that's what Shuusuke gets for buying BL magazines. [[{{Blackmail}} Not like he had much choice in the matter.]]
* ModestyTowel: Subverted hardcore in Chapter 1/Episode 1.
* MundaneMadeAwesome: Shuusuke's ultra high speed glancing look.
* MyGodWhatHaveIDone: Shuusuke has this reaction when he realizes that [[spoiler:his past perversions have made Iroha [[StalkerWithACrush what]] [[{{Yandere}} she]] [[LoveMakesYouCrazy has become]] today, and even [[TheAtoner tries to make a complete turnaround on his lifestyle]]. Not that it sticks thanks to both Nao and Iroha]]. He gets over it.
* NonindicativeTitle: [[SarcasmMode Oh, sure,]] "''[[SuspiciouslySpecificDenial I Don't Like You at All]]''"?
* NotBloodSiblings: [[IncestSubtext So Nao is now free to obsess about her big brother!]]
* OjouRinglets: Rin and Ran.
* OlderThanTheyLook: A lot of the female characters.
* OnlySaneMan: Haruka of ThoseTwoGirls.
* OverlyLongTitle: Damn horribly straight to the point where it was shortened by fans as "Onichan no Koto". Anime {{eyecatch}}es split the title into ''three'' lines.
* PantyShot: In the manga especially.
-->"[[LampshadeHanging That panty-shot is pointless!]]"
* PatientChildhoodLoveInterest: Subverted -- Iroha is [[{{Yandere}} not very patient]].
* [[spoiler:PlayingDoctor: That's how Shunsuke winds up getting a ChildhoodMarriagePromise with Iroha.]]
* PolarOppositeTwins: Ran and Rin.
* PornStash: Shusuke's is [[UpToEleven of epic proportions]].
* [[PromotionToOpeningTitles Promotion To Title Page]]: Kondou
* ProperTightsWithSkirt: Kondou
* PsychoLesbian: Rin "Clone" Yatagai towards Nao. But ends up [[AccidentalKiss kissing Iroha]] and falls in love with her instead, much to Iroha's horror.
* RapunzelHair: Iroha and [[ThoseTwoGirls Haruka and Hirono]].
* SeriousBusiness: Kondou and her [[YaoiFangirl Yaoi]].
* ShoutOut: When the AGE goes to Akihabara, we see posters for ''Kiss X Sis'', ''VisualNovel/YosugaNoSora'' and ''Manga/{{Chu-Bra}}'', the anime adaptations of which, like this series, were produced by Starchild.
** Ran's fantasy plot has a lot of StarWars elements in it. From Ran's dress and nickname "Leila".
** In episode 10 there was a [[LightNovel/KoreWaZombieDesuKa Masou-Shoujo]] cosplayer.
* SomethingElseAlsoRises: Chapter 2. Did you really think this kind of manga could go more than one chapter without it?
* StalkerWithACrush: Nao knows when Shuusuke learned to collect, read and hide his porn. The stuff Iroha's done is too long to list here.
-->"[[LampshadeHanging Shuusuke doesn't have any privacy does he?]]"
* StealthPun: May or may not be intentional, but often, the CensorBox... for English-speaking audiences, anyway.
* SuspiciouslySpecificDenial: No, Shuusuke's father doesn't find his S&M porn one bit erotic.
** The title of the manga itself, too.
* ThisLoserIsYou: The AGE, taken to [[LeaningOnTheFourthWall fourth-wall leaning]] levels on their trip to Akihabara.
* ThoseTwoGirls : Haruka and Hirono
** Also those three guys of the AGE.
* TitleDrop: at the very end.
* TooHotForTV
* {{Tsundere}}: Nao play-acts this when she believes Shuusuke has had enough {{fanservice}}.
** The title of the series as well.
* VictoriousChildhoodFriend: Captain Kirishima wants to have one.
** Also, Iroha is determined to become one.
* VisualInnuendo: ''Everything'' at the festival in Episode 9, including fireworks symbolizing orgasm. Then the joke is made obvious at the end of the episode, implying that earlier Nao had climaxed at Shuusuke's touch.
* {{Yandere}}[=/=]ClingyJealousGirl: Nao ''and'' [[spoiler:Iroha]]. The two are pleasant on the surface, but by chapter 12... [[http://www.mangafox.com/manga/oniichan_no_koto_nanka_zenzen_suki_ja_nai_n_da_kara_ne/v01/c012/19.html well...]]
** Rin's [[EvenTheGirlsWantHer Fangirls]]
* YaoiFangirl: Kondou
* ZettaiRyouiki: Nao and sometimes Iroha.
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