Seen it?

Because I Don't Like My Big Brother At-All--!!

Name: Because I Don't Like My Big Brother At-All--!!
Genre: Animation, Comedy

TV·2011–2011·1 season, 12 episodes·tvk·Animation, Comedy·25m

Not streaming in your region — see every region's options

Nao Takanashi loves her brother Shūsuke despite the incest taboo. Nao thinks that Shūsuke is her blood relative, but in fact she is an adopted daughter, whose parents have died. After Nao learns the fact, she wants to fall in love normally with Shūsuke because siblings by adoption can marry under the family law in Japan. However, she finds herself competing with Shūsuke's childhood friend, Iroha Tsuchiura, and his class president and yaoi lover, Mayuka Kondō.

Highest-rated episodes all ranked

01Wicked Usual Day of a Brother And SisterS01E01 · 10.0Nao Takanashi has long been trying to tempt her brother, Shūsuke, into entering an immoral (i.e. incest) relationship with her, with Shūsuke barely being able to resist. Nao goes to great lengths for Shūsuke to think of her perversely by doing things such as letting him purposely look underneath her skirt (and once letting him see her completely naked) but then she always gets him into trouble afterward so as to make it look like Shūsuke is the immoral pervert. One day, while Nao searches through Shūsuke's room for his collection of porn magazines, she then finds a hidden family photo album and is surprised to find out that there are no childhood pictures of her in it. After Shūsuke was finished being scolded about his porn collection, Nao confronts her parents, Shūji and Nanaka, about the album.
02Twintail, Attacking Brother and SisterS01E02 · 10.0It turns out that Nao and Shuusuke are not related by blood. While most people would be upset after finding out something like that, Nao took it in the most positive way possible - it meant that there was nothing to get in the way between her and Shuusuke. The next day, a new student named Iroha transfers into Nao's class. At first Nao gets along with her really well, and they even end up having lunch together... but while they are eating Shuusuke comes to give Nao her keys which she left at home. Even though Iroha and Shuusuke should be meeting each other for the first time, Iroha seems strangely interested in him...
03A Rival Appears! Brother and Sister in Huge Trouble!S01E03 · 10.0Iroha coerces Shūsuke into going on a date with her, and Nao decides to follow them, while her friends, Haruka and Hirono, decide to tail her as well. Iroha takes Shūsuke various places including a movie theater, an arcade and a swimsuit store. At the end of the date, Iroha tries to get Shūsuke to kiss her, but he refuses. Iroha tries to drag him somewhere else, but Nao manages to bail him out. Nao begins treating Shūsuke coldly, leading him to realize that she knew about his date with Iroha. When Iroha scares Shūsuke with the notion that she knows everything he's been doing (having been watching him through a telescope), Shūsuke rolls on the floor when Nao enters, getting a look at her panties which reawakens his normal perversion, much to Nao's delight.

Castfull cast & details

Eri KitamuraNao Takanashi (voice)

Kazusa AranamiMayuka Kondou (voice)

Toshiyuki ToyonagaShuusuke Takanashi (voice)

Sayaka OharaNanaka Takanashi (voice)

Hideki Ogihara

Hideki OgiharaShuuji Takanashi (voice)

Ryoko ShiraishiHirono Kusuhara (voice)

Shinnosuke TachibanaKeiichiro Kishikawa (voice)

Eriko NakamuraHaruka Katou (voice)

Episodes by season

Season0112Episodes2011Aired 10.0Season avg

S01E01Season's bestWicked Usual Day of a Brother And SisterJanuary 8, 2011 10.0Nao Takanashi has long been trying to tempt her brother, Shūsuke, into entering an immoral (i.e. incest) relationship with her, with Shūsuke
S01E02Twintail, Attacking Brother and SisterJanuary 15, 2011 10.0It turns out that Nao and Shuusuke are not related by blood. While most people would be upset after finding out something like that, Nao too
S01E03A Rival Appears! Brother and Sister in Huge Trouble!January 23, 2011 10.0Iroha coerces Shūsuke into going on a date with her, and Nao decides to follow them, while her friends, Haruka and Hirono, decide to tail he
S01E04If My Little Sister Wore a SwimsuitJanuary 30, 2011—Nao coerces Shūsuke into going to the beach with her, though coincidentally they end up running into Haruka, Hirono and Iroha, who Nao recog
S01E05Mister X Strikes Brother!February 6, 2011—While running back from buying a new porno magazine, Shūsuke bumps into another person. They get their packages mixed up and Shūsuke ends up
S01E06My Brother has Dreams of Black Panty StockingsFebruary 13, 2011—After having Iroha spy on Shūsuke and Mayuka the previous night, Nao tries putting on black pantyhose and clinging onto Shūsuke as he sleeps
S01E07My Brother and His Friends' AkibaFebruary 20, 2011—Shūsuke and his friends go on a trip to Akihabara in search of adult goods while Nao and Iroha decide to follow them. After visiting an adul
S01E08Aim for Brother's Top!February 27, 2011—When Shūsuke gets a report about him failing in all of his subjects, he then realizes that he has to take a follow-up exam or risk having to
S01E09Summer! Festivals! Brother and Sister's M:i:VMarch 6, 2011—Shūsuke goes to a Matsuri festival with Nao and Iroha, who compete with each other to try and seduce him. Meanwhile, the A.G.E Explorers go
S01E10Brother Saves the WorldMarch 13, 2011—Late on night, Shūsuke spots a sexy cosplayer named Ran Yatagai on top of a vending machine. He later sees Ran, who calls herself Princess L
S01E11Calling Out to Brother from the Center of the WorldMarch 20, 2011—As Shūsuke puts up with more of Ran's dubious rituals, Rin forces Nao to hang out with her by threatening to tell Shūsuke that she had been
S01E12I Don't Like My Big Brother at All!!March 27, 2011—Shusuke and Nao are left alone in the house when their parents go on an overnight trip. Nao takes the opportunity to try and seduce Shusuke