definitive sibling relationship watchlist
Anime
(the following reviews may include spoilers)
also KEEP IN MIND: many of these are appropriate for adults only!
stories of siblings being more than just siblings with one another as a main focus in the series (not necessarily romantic, though a lot of these are). everything goes from mild brocon/siscon to almost hentai. (no actual hentai is included.)
these anime are organized roughly in order from most wholesome to most perverted. i also include a short synopsis of each one along with some useful info, hopefully it can be helpful in picking a new show to watch. just keep in mind that not all of this is worth watching, i just want to give you all the options.
i only included the main entry [with one exception, for good reason] if a series has multiple seasons/ovas/movies etc. (no stacking the list with random ovas here!)
ALSO NOTE: this list is under construction, all the entries at the bottom without a synopsis i have yet to watch and categorize.
also KEEP IN MIND: many of these are appropriate for adults only!
stories of siblings being more than just siblings with one another as a main focus in the series (not necessarily romantic, though a lot of these are). everything goes from mild brocon/siscon to almost hentai. (no actual hentai is included.)
these anime are organized roughly in order from most wholesome to most perverted. i also include a short synopsis of each one along with some useful info, hopefully it can be helpful in picking a new show to watch. just keep in mind that not all of this is worth watching, i just want to give you all the options.
i only included the main entry [with one exception, for good reason] if a series has multiple seasons/ovas/movies etc. (no stacking the list with random ovas here!)
ALSO NOTE: this list is under construction, all the entries at the bottom without a synopsis i have yet to watch and categorize.

ONA, 2008,
7 eps
Me:-
Author:8
*personal recommendation*
a wholesome story about twin sisters working together to make their dreams come true through high school. there's a love triangle aspect that isn't very good imo but otherwise it's a nice story.
blood related: yes
kissing: no
sexual content: no
themes: yuri, twins
see also: prequel and sequel ovas
a wholesome story about twin sisters working together to make their dreams come true through high school. there's a love triangle aspect that isn't very good imo but otherwise it's a nice story.
blood related: yes
kissing: no
sexual content: no
themes: yuri, twins
see also: prequel and sequel ovas

TV, 2018,
12 eps
Me:-
Author:6
this show is a very lighthearted comedy, it has imoutos and a maid cafe, not sure what else to say about it.
blood related: yes
kissing: no
sexual content: no
themes: short episodes
blood related: yes
kissing: no
sexual content: no
themes: short episodes
Mahouka Koukou no Rettousei
The Irregular at Magic High School

TV, 2014,
26 eps
Me:-
Author:10
*personal recommendation*
a sci-fi magic show with a very OP main character and his sister who is a huge bro-con; it's implied the affection flows both ways. the sci-fi battles and lore are fun, and i'd recommend watching the prequel (reminiscence arc) to get a better idea of the why and how of the siblings' relationship.
blood related: yes
kissing: no
sexual content: no
see also: prequel movie, second season, spinoff, movie
a sci-fi magic show with a very OP main character and his sister who is a huge bro-con; it's implied the affection flows both ways. the sci-fi battles and lore are fun, and i'd recommend watching the prequel (reminiscence arc) to get a better idea of the why and how of the siblings' relationship.
blood related: yes
kissing: no
sexual content: no
see also: prequel movie, second season, spinoff, movie
GJ-bu
GJ Club

TV, 2013,
12 eps
Me:-
Author:-
a boy in a school club with four girls who pretend to be his little sister (and one actual little sister) all vying for attention in their own ways. [still watching, review in progress]
blood related: yes and no
kissing:
sexual content:
themes:
see also: special ova
blood related: yes and no
kissing:
sexual content:
themes:
see also: special ova

TV, 2014,
12 eps
Me:-
Author:6
slice of life about a very clingy stepsister causing trouble for her little brother.
blood related: no
kissing: no
sexual content: no
themes: short episodes
blood related: no
kissing: no
sexual content: no
themes: short episodes

TV, 2015,
12 eps
Me:-
Author:6
a brother and his four sisters live together; short comedy and mild ecchi themes.
blood related: yes
kissing: almost
sexual content: no
themes: short episodes
blood related: yes
kissing: almost
sexual content: no
themes: short episodes
No Game No Life
No Game, No Life

TV, 2014,
12 eps
Me:-
Author:-
gamer stepsiblings in a fantasy isekai world, it's shown they both have a thing for each other and struggle to be apart, but fairly mild as they go.
blood related: no
kissing:
sexual content: no
blood related: no
kissing:
sexual content: no
Yuru Yuri
YuruYuri: Happy Go Lily

TV, 2011,
12 eps
Me:-
Author:9
a CGDCT yuri comedy... i was on the fence as to whether to add this one, as it's not a main theme, but it becomes more common later on in the seasons for the sisters of the main characters to end up in the yuri situations too (namely S1E12, S2E3, S2E11, S3E4)
blood related: yes
kissing: yes
sexual content: no
themes: yuri, twins
see also: two more seasons and two OVAs
blood related: yes
kissing: yes
sexual content: no
themes: yuri, twins
see also: two more seasons and two OVAs
Tenshi Kinryouku
Angel Sanctuary

OVA, 2000,
3 eps
Me:-
Author:8
where do i even begin? so a high school boy and his sister are in love, but he has the ancient spirit of an angel trapped inside his body. meanwhile both angels and demons try to reawaken the spirit because they need her for a holy war. this one is a wild ride and i think it's pretty underrated.
blood related: yes
kissing: yes
sexual content: no
themes: some blood and gore
see also: the manga is so much better, read that!
blood related: yes
kissing: yes
sexual content: no
themes: some blood and gore
see also: the manga is so much better, read that!

TV, 2010,
12 eps
Me:-
Author:7
a classic within the genre, this show tells the story of a sister who is obsessed with incestuous erotic games. after introducing her brother to them, they grow closer, while having to deal with various relationships and other life troubles.
blood related: yes
kissing: a little
sexual content: nope
see also: two ovas and a second season
blood related: yes
kissing: a little
sexual content: nope
see also: two ovas and a second season
Eromanga-sensei
Eromanga Sensei

TV, 2017,
12 eps
Me:-
Author:-
blood related: no
kissing:
sexual content:
other notes: same author as oreimo
see also: ova
kissing:
sexual content:
other notes: same author as oreimo
see also: ova
Yami to Boushi to Hon no Tabibito
Yamibo: Darkness, The Hat and the Travelers of the Books

TV, 2003,
13 eps
Me:-
Author:9
a girl's adopted sister disappears one day and, because of her crush on the sister, she goes on a grand fantasy adventure to try to reunite with her. keep in mind that if you're watching solely for their relationship there is a fair bit of filler content not related to it and the ending is fairly sad. still a very interesting adventure.
blood related: no
kissing: a little
sexual content: some nudity
blood related: no
kissing: a little
sexual content: some nudity

TV, 2008,
12 eps
Me:-
Author:9
*personal recommendation*
due to an arranged marriage, a rich girl moves in with a boy and his sister. as their relationship progresses, it becomes more apparent that the brother and sister have feelings for each other. the whole show is underscored by goofy humor, though the relationship dynamics could have been a bit deeper.
blood related: yes
kissing: not between the siblings
sexual content: some uncensored nudity
see also: an ova that isn't very good
due to an arranged marriage, a rich girl moves in with a boy and his sister. as their relationship progresses, it becomes more apparent that the brother and sister have feelings for each other. the whole show is underscored by goofy humor, though the relationship dynamics could have been a bit deeper.
blood related: yes
kissing: not between the siblings
sexual content: some uncensored nudity
see also: an ova that isn't very good

OVA, 2005,
1 ep
Me:-
Author:5
a short tale of siblings falling in love with a bit of a bittersweet ending.
blood related: yes
kissing: yes
sexual content: some, censored
blood related: yes
kissing: yes
sexual content: some, censored

ONA, 2013,
12 eps
Me:-
Author:5
short comedy with a brocon younger sister who's both taller than her brother and overbearing. expect ecchi comedy, girls trying to take their clothes off, and many nosebleeds.
blood related: yes
kissing: no
sexual content: ecchi jokes
themes: short episodes
blood related: yes
kissing: no
sexual content: ecchi jokes
themes: short episodes
Imouto sae Ireba Ii.
A Sister's All You Need

TV, 2017,
12 eps
Me:-
Author:8
story about an author who is obsessed with little sister relationships. doesn't contain much actual sibling romance but many themes and references to it.
blood related: n/a
kissing: yes
sexual content: yes (themes and censored nudity)
themes: sexual assault (why the fuck is this pg-13)
blood related: n/a
kissing: yes
sexual content: yes (themes and censored nudity)
themes: sexual assault (why the fuck is this pg-13)

TV, 2018,
12 eps
Me:-
Author:8
a girl starting at a new school gets sexually assaulted by the student council president who turns out to be her new stepsister, but stealing that first kiss ends up with unforeseen consequences and character development for both.
blood related: no
kissing: lots
sexual content: nope
themes: yuri, sexual assault
blood related: no
kissing: lots
sexual content: nope
themes: yuri, sexual assault
Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!!
Because I Don't Like My Big Brother at All!!

TV, 2011,
12 eps
Me:-
Author:8
a girl with a crush on her older brother discovers that they're not blood related which makes it ok to live out her fantasies with him, but other girls get in the way of them growing closer. *this show is pretty awful from most points of view but i laughed my ass off the whole time at how absurd it was, your mileage may vary...*
blood related: no
kissing: no
sexual content: yes
blood related: no
kissing: no
sexual content: yes
Boku wa Tomodachi ga Sukunai
Haganai: I don't have many friends

TV, 2011,
12 eps
Me:-
Author:8
a harem rom-com in which one of the harem members is the mc's younger sister who is a big bro-con. not much happens between them but the show does include some nudity and fanservice.
blood related: yes
kissing: no
sexual content: not much
other notes: naked loli warning
see also: ova, second season
blood related: yes
kissing: no
sexual content: not much
other notes: naked loli warning
see also: ova, second season

TV, 2012,
12 eps
Me:-
Author:-
a harem with a little sister who is a serious bro-con and she has to compete with three other women who live with them. lots of ecchi and fanservice combined with a typically clueless harem protagonist, well, you know if this genre is for you.
blood related: yes
kissing:
sexual content: yes, barely censored
blood related: yes
kissing:
sexual content: yes, barely censored
Grisaia no Meikyuu: Caprice no Mayu 0
The Labyrinth of Grisaia: The Cocoon of Caprice 0

Special, 2015,
1 ep
Me:-
Author:8
to be clear, this is a special that's part of a larger series, the main fruit of grisaia series doesn't have any questionable sibling action but the special does.
blood related: yes
kissing: yes
sexual content: yes
themes: very depressing
blood related: yes
kissing: yes
sexual content: yes
themes: very depressing
Domestic na Kanojo
Domestic Girlfriend

TV, 2019,
12 eps
Me:-
Author:7
a boy's life is turned upside down when the girl he lost his virginity to and her sister (the teacher he has a crush on) become his new step-sisters. they have to deal with all kinds of messy feelings between the three in order to coexist.
blood related: no
kissing: yes
sexual content: yes
blood related: no
kissing: yes
sexual content: yes
Saikin, Imouto no Yousu ga Chotto Okashiinda ga.
Recently, my sister is unusual.

TV, 2014,
12 eps
Me:-
Author:8
*personal recommendation*
the show starts with a very horny ghost locking a girl in a chastity belt and trying to force her to have sex with her brother. there's girl-on-girl action too, various uncomfortable situations, and a rather clueless brother as well.
blood related: no
kissing: yes
sexual content: yes (mostly uncensored)
themes: sexual assault, yuri
the show starts with a very horny ghost locking a girl in a chastity belt and trying to force her to have sex with her brother. there's girl-on-girl action too, various uncomfortable situations, and a rather clueless brother as well.
blood related: no
kissing: yes
sexual content: yes (mostly uncensored)
themes: sexual assault, yuri
Shinmai Maou no Testament
The Testament of Sister New Devil

TV, 2015,
12 eps
Me:-
Author:7
a boy gets two new stepsisters who are secretly powerful demons, they end up bound by fate and magic; ecchi comedy ensues. there's also some big magic battles, demon politics, and more.. think of it as "HSDXD: stepsibling edition"
blood related: no
kissing:
sexual content: yes
see also: second season, three ovas
blood related: no
kissing:
sexual content: yes
see also: second season, three ovas

TV, 2010,
12 eps
Me:-
Author:8
this follows a parallel story to the OVA version of kissxsis, but it's more censored and generally not as hot. it has its moments, but i would recommend the OVA version first (see below)
blood related: no
kissing: lots
sexual content: yes, censored
blood related: no
kissing: lots
sexual content: yes, censored

OVA, 2008,
12 eps
Me:-
Author:9
*personal recommendation*
there's not a lot to it, other than two perverted stepsisters with an intense desire to pleasure their younger brother. the underlying story isn't too important, as you're probably here to see the perverted ways in which they express their affection.
blood related: no
kissing: lots
sexual content: yes, censored
there's not a lot to it, other than two perverted stepsisters with an intense desire to pleasure their younger brother. the underlying story isn't too important, as you're probably here to see the perverted ways in which they express their affection.
blood related: no
kissing: lots
sexual content: yes, censored
Aki-Sora
Aki Sora

OVA, 2009,
1 ep
Me:-
Author:5
it's pretty much an older sister pleasuring her younger brother, without much substance or story. but some find it hot, so your mileage may vary.
blood related: yes
kissing: i think
sexual content: just censored enough to not be hentai
see also: second ova
blood related: yes
kissing: i think
sexual content: just censored enough to not be hentai
see also: second ova

OVA, 2013,
2 eps
Me:-
Author:5
a reverse harem where a sister is courted by various men while her jealous brother tries to protect her.
blood related: no
kissing: yes
sexual content: borderline hentai
themes: sexual assault (i hope men don't act like this in real life)
blood related: no
kissing: yes
sexual content: borderline hentai
themes: sexual assault (i hope men don't act like this in real life)
Yosuga no Sora: In Solitude, Where We Are Least Alone.
Yosuga no Sora

TV, 2010,
12 eps
Me:-
Author:8
a romance story about a boy falling in love with multiple different women (not at the same time, the story explores different paths he can take) but he eventually ends up running away with his sister. surprisingly well written for almost hentai.
blood related: yes
kissing: yes
sexual content: extreme
themes: twins
blood related: yes
kissing: yes
sexual content: extreme
themes: twins

TV, 2014,
12 eps
Me:-
Author:7
this show is uh... pretty infamous in its own right. i guess i'd ask the question, "do you love your sister so much, you'd let her eat you?" not necessarily romantic but i think it deserves to be on this list.
blood related: yes
kissing: no
blood and gore: extreme
themes: short episodes
blood related: yes
kissing: no
blood and gore: extreme
themes: short episodes
Kono Naka ni Hitori, Imouto ga Iru!
NAKAIMO - My Little Sister Is Among Them!

TV, 2012,
12 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes: among us!! sus!
kissing:
sexual content:
themes: among us!! sus!
Ore ga Suki nano wa Imouto dakedo Imouto ja Nai
My Sister, My Writer

TV, 2018,
10 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes:
kissing:
sexual content:
themes:

OVA, 1990,
2 eps
Me:-
Author:-
blood related:
kissing:
sexual content: yes
other notes: just don't watch this
kissing:
sexual content: yes
other notes: just don't watch this
Ane Log: Moyako Neesan no Tomaranai Monologue
Ane Log: Big Sister Moyako's Never-ending Monologue

OVA, 2014,
3 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes:
kissing:
sexual content:
themes:
Kimi ga Aruji de Shitsuji ga Ore de
They Are My Noble Masters

TV, 2008,
13 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes:
kissing:
sexual content:
themes:
Onegai☆Twins
Please Twins!

TV, 2003,
12 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes:
kissing:
sexual content:
themes:
Rakudai Kishi no Cavalry
Chivalry of a Failed Knight

TV, 2015,
12 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes:
kissing:
sexual content:
themes:
Hentai Ouji to Warawanai Neko.
The "Hentai" Prince and the Stony Cat.

TV, 2013,
12 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes:
kissing:
sexual content:
themes:
Baka to Test to Shoukanjuu
Baka & Test - Summon the Beasts

TV, 2010,
13 eps
Me:-
Author:-
blood related:
kissing:
sexual content:
themes:
kissing:
sexual content:
themes: