History BrotherSisterIncest / AnimeAndManga

* In ''Literature/ChivalryOfAFailedKnight'', Ikki's younger sister Shizuku is interested in this. Ikki, to his credit, finds this highly disturbing and other characters note that her behavior is taboo. Her behavior is due to the neglect and abuse Ikki suffered at the hands of the Kurogane family, so she decides to love him enough to make up for every other member of their family. Shizuku's behavior can clearly cross the line of normal brother-sister relations, which causes quite a few raised eyebrows around campus.

** She wants to with sleep with Leina and pouted when she wasn't allowed to [[GirlsLove spend the night in her room]], in the first episode. Leina is more than aware of Elina's blatant incestuous crush on her, which is part of the reason she ran away from home and doesn't intend to return. Though she still [[SkinshipGrope indulges Elina on occasion.]] Such as Episode 9, where she bathed together with her, then spent the night spooning with her in bed, while both were in the nude.

* Cain Hargreaves, the lead of the ''Manga/CountCain'' manga and its sequel series ''Godchild'', has this as part of his origin story. Turns out part of why he has the family curse so bad/ slash why his parents always acted so weird with him/[[ArtisticLicenseBiology why he has]] sort of golden eyes, is that his mother isn't his mother. His father's crazy sister Augusta is. When he finds out and goes to see her in her asylum, she jumps to her death in front of him.

* ''Manga/SisconAniToBroconImoutoGaShoujikiNiNattara'' has Ritsu and Uta Fukami. Originally they are merely close siblings, but after Uta is annoyed that Ritsu plays with her less due to his friends keeping him at school more often, including one girl that shows interest in him, [[TheBeard Ritsu chooses to lie to his friends that Uta is his girlfriend in order to be able to find excuse to spend more time at home with his sister]] (helped by the fact that they don't attend the same school, and thus none of their friends know their actual relationship. Ritsu's friends only know that he has a sister, and Uta's friends likewise), all the while pretending they're lovers outside of their home. However, their pretend lover relationship [[RomanticFakeRealTurn eventually turns into a geniune romance]], though they choose to try their best to not show it at home in fear of their parents finding out.

* Averted in ''Literature/BakaAndTestSummonTheBeasts'' because while Akira Yoshii really wants to move her relationship with her younger brother to the next level, the normally super-horny Akihisa surprisingly expressly considers incest to be disturbingly immoral and constantly resists the nonstop attempts at seduction of his older sister.

* ''Manga/{{Berserk}}'' subverts this somewhat, since [[spoiler: Serpico and Farnese were in love at one point and are half-siblings, but Serpico's love becomes more brotherly after he learns that Farnese is his half sister.]]

* In ''Anime/MazeMegaburstSpace'', not only is the central couple a pair of blood siblings, and not only is the central plot their successful and unrepentant plot to be together, but it goes even beyond that...

** Meanwhile, perhaps to provide contrast, there's a minor character (Matagu) who's ''blatantly'' attracted to his little sister Haruko.
*** And Haruko doesn't quite reciprocate, but at least clearly knows and doesn't mind. After describing his use of the HandsOnApproach, we get this:

* ''LightNovel/HybridXHeartMagiasAcademyAtaraxia'': Kizuna (age 17) has his first [[DeusSexMachina Climax Hybrid]] session with his biological 27-year old sister, Reiri, in volume 5 because there were no other options. However, a flashback to their childhood shows Reiri had an unnatural interest in her brother, even then and often bathed with him. They have additional sessions in volumes 8 and 10, by which time, Reiri fully accepts that she's in love with Kizuna. By volume 13, [[spoiler:they have unprotected sex almost every day, ''[[ExtremeLibido usually for hours]]'' at a time. It eventually results in Reiri being the first to become pregnant with his child]].

* The secret of the [[BigScrewedUpFamily Kuhouin family]] in ''LightNovel/{{Kurenai}}'' is that [[spoiler:each girl born into the family is imprisoned in the "Inner Sanctuary" for their entire lives, for the sole purpose of bearing the children of their brothers to continue the lineage. Their very existence is kept hidden from the public, and the male members of the family marry women from outside the family just to keep up the masquerade]].

* ''LightNovel/{{MM}}'' main character Taro is actively pursued by his older sister AND [[ParentalIncest mother]]. When he gets amnesia for an episode both try to pretend being his pregnant lover.