Nao Takanashi is an ordinary junior high school girl who — title notwithstanding — 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 Porn Stash of anything not related to Brother–Sister Incest, Nao comes upon a family photo album full of childhood photos of Shuusuke and a girl in 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 Not Blood Siblings, she's elated that she can finally pursue a full-fledged relationship with him. However, a blonde girl in pigtails appears shortly thereafter... and all hell breaks loose.
I Don't Like You at All, Big Brother!!, (Oniichan no Koto Nanka Zenzen Suki ja Nai Dakara ne!!) is a romantic comedy manga by Kusano Kouichi, which ran in the seinen publication Web Comic High! from 2008 to 2016. It has an anime adaptation that first aired in Winter 2011. The manga has been licensed by Seven Seas Entertainment.
Tropes:
- Animal Motif: Baby penguin versus Cat.
- Beach Episode: Early on, of course. Chapter 3/Episode 4.
- Blackmail: Kondou threatens Shuusuke with telling Nao of his Porn Stash after he rips off her yaoi magazines. Then again, that's a moot point, considering the kind of girl Nao is.
- Blatant Lies: The title translates to " I Don't Like You at All, Big Brother"
- Blonde, Brunette, Redhead: Iroha, Kondou, and Nao, respectively.
- Brother–Sister Incest: Nao and Shuusuke, natch. Justifiable, since they're Not Blood Siblings, and Japanese laws allow for marriage between siblings by adoption.
- Caught with Your Pants Down: Shuusuke was completely nonplussed when Iroha told him how much he masturbates (five times a day!), down to which hand he uses. It turned out she snooped him through a telescope.
- Censor Box: A baby penguin for Nao, as well as a cat for Iroha (both of which become their Animal Motifs). 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 Panty Shot in the opening of every episode.
- Childhood Marriage Promise: Iroha gets this from Shuusuke in exchange for Playing Doctor with him. Shuusuke didn't think she was serious.
- Clingy Jealous Girl: Iroha fits this to a T. Nao is this especially towards to the former.
- Date Peepers: Nao does this during Shuusuke's date with Iroha; and later Those Two Girls peep on them. Taken to hilarious extremes in episode 3 of the anime when the AGE group shows up and spies on them, too.
- A Day In The Lime Light: Episode 7 focuses on the AGE explorers, rather than just Shuusuke.
- Dissonant Serenity:
- Put Nao and Iroha in the same room together.
- Add Kondou and it gets even worse.
- Double Standard Rape: Female on Male: Averted — Shuusuke is rather traumatized when he's forcibly french-kissed and molested by Iroha.
- Enemy Mine: Nao and Iroha team up once Kondou starts commanding most of Shuusuke's attention
- First-Episode Twist: Nao is adopted and is the sole survivor of a car crash that killed her parents, who happen to be Shuusuke's parents' friends.
- Fourth-Wall Portrait: A variation. Kuro-neesan insists that Nao has "wonderful lips". We'll have to take her word for it.
- Funny Background Event: In episode 10 it has Mr. X/Kondou running to the store and back.
- Gratuitous English: 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!"
- Heroic BSoD: In Chapter 2, Nao has one (at first) when she finds out that her and Onii-chan are Not Blood Related.
- Hypocrite:
- Nao was puzzled by Yamashiro's little stepsister fetish.
- Laser-Guided Karma: Rin stalks Nao, and later forcefully kisses Iroha and then abducts her.
- Leaning on the Fourth Wall: The conversation in the anime/manga shop in Episode 7 could easily be about the show itself and its presumed audience.
- Mistaken for Gay: Well, that's what Shuusuke gets for buying BL magazines. Not like he had much choice in the matter.
- Mundane Made Awesome: Shuusuke's ultra high speed glancing look.
- My God, What Have I Done?: Shuusuke has this reaction when he realizes that his past perversions have made Iroha what she has become today, and even tries to make a complete turnaround on his lifestyle. Not that it sticks thanks to both Nao and Iroha. He gets over it.
- Not Blood Siblings: So Nao is now free to obsess about her big brother!
- Patient Childhood Love Interest: Subverted — Iroha is not very patient.
- Playing Doctor: That's how Shunsuke winds up getting a Childhood Marriage Promise with Iroha.
- Psycho Lesbian: Rin "Clone" Yatagai towards Nao. But ends up kissing Iroha and falls in love with her instead, much to Iroha's horror.
- Serious Business: Kondou and her Yaoi.
- Shout-Out:
- When the AGE goes to Akihabara, we see posters for Kiss X Sis, Yosuga no Sora and Chu-Bra, the anime adaptations of which, like this series, were produced by Starchild.
- Ran's fantasy plot has a lot of Star Wars elements in it. From Ran's dress and nickname "Leila".
- In episode 10 there was a Masou-Shoujo cosplayer.
- Something Else Also Rises: Chapter 2. Did you really think this kind of manga could go more than one chapter without it?
- Stalker with a Crush: Nao knows when Shuusuke learned to collect, read and hide his porn. The stuff Iroha's done is too long to list here.
- Stalking Is Funny if It Is Female After Male: It clearly would not be nearly as tolerated if the genders were revered and a guy was the one staring out at a telescope into a girl's bedroom.
- Stealth Pun: May or may not be intentional, but often, the Censor Box... for English-speaking audiences, anyway.
- Sultry Belly Dancer: Ran is a very dedicated cosplayer who adopts the persona of "Princess Leila". In her effort to find a mate, she performs a ritual dance; she performs one for Shusuke in private when she feels he's the one for her.
- Suspiciously Specific Denial:
- No, Shuusuke's father doesn't find his S&M porn one bit erotic.
- The title of the manga itself, too.
- This Loser Is You: The AGE, taken to fourth-wall leaning levels on their trip to Akihabara.
- Those Two Girls : Haruka and Hirono
- Also those three guys of the AGE.
- Title Drop: at the very end.
- Tsundere: Nao play-acts this when she believes Shuusuke has had enough fanservice.
- The title of the series as well.
- Victorious Childhood Friend:
- Captain Kirishima wants to have one.
- Iroha is determined to become one.
- Visual Innuendo: 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.
- Rin's Fangirls
