Akiko and Akito grew up separately in Oniichan dakedo Ai Sae Areba Kankeinai yo ne! after their parents died, but finally they get to live together and go to school together again! Akiko's feelings for Akito have changed quite a bit over the years, though, and while he sees her always as just his little sister, she sees him as something so much more. Already determined to win him over, Akiko becomes even more ambitious and determined when other girls start to live with them - and are also capturing Akito's attention! She has to work extra hard to not only win out over all these other girls but also to change her brother's perception of her from a little sister to a real woman.

Yet another little sister with a strong brother complex, Oniichan dakedo Ai Sae Areba Kankeinai yo ne! has a lot in common with Kiss x Sis. While it's only one girl this time, much like Ako and Riko, Akiko has to compete for her brother's attention. And all the while, even when Akito starts to see her differently, he's constantly reminded that she is his sister and backs down much to the chagrin of Akiko - just like Keita.

These determined little sisters that just want their brothers to see them as women and not just little girls really tie Kiss x Sis and Oniichan dakedo Ai Sae Areba Kankeinai yo ne! together. Plus they are of course both light-hearted and very fun to watch - with plenty of sexy and intense ecchi to enjoy too. And both have really great - and long - OVAs if the main series isn't enough for you!

Saikin, Imouto no Yousu ga Chotto Okashiinda ga. is a comedy ecchi with a tragic sounding plot. But don't worry; we assure you it’s quite funny! When Mr. and Mrs. Kanzaki get married, they already have two children - a son and daughter that suddenly find themselves step-siblings. The girl, Mitsuki, had a hard time adjusting to her new stepfather and step-brother, Yuuya. But when an accident lands her in the hospital where she becomes possessed by a girl named Hiyori, everything starts to change.

When she was alive, Hiyori was hopelessly in love with Yuuya, and her unfinished business with him is preventing her from getting into Heaven. If Mitsuki wants to help Hiyori's spirit and gain total control of her body back, she has to consummate Hiyori and Yuuya's relationship - with her own body!

Saikin, Imouto no Yousu ga Chotto Okashiinda ga. is a story of incest between step-siblings rather than blood-related ones, just like Kiss x Sis. So if you like the idea of brother and sister together but aren't so into them being genetically from the same family, this is another romance story for you! Ako and Riko both compete for their brothers' attention, and help one another to gain it - they are both partners and rivals. Hiyori and Mitsuki have a similar relationship.

Of course, Mitsuki is doing her best to help Hiyori, but what happens when she starts to realise she might have feelings of her own for Yuuya to deal with too? It leads to a difficult relationship between the two girls of helping one another but competing for Yuuya at the same time. That unique dynamic between the girls makes Saikin, Imouto no Yousu ga Chotto Okashiinda ga. similar to Kiss x Sis as well.

In Onegai☆Twins, Maiku Kamishiro doesn't remember anything about his past. His only clue to who his family possibly could be is a picture of him as a child playing with a girl in front of a blue house. Maiku manages to find the house and moves in hoping to learn more about his mysterious past. What he never expected was for two different girls to show up at his door, both also holding that same picture - and both claiming to be his twin sister! Maiku has no way to know for sure which girl is actually his twin, so he allows them both to live with him until he can learn the truth.

Kiss x Sis and Onegai☆Twins are both relationship stories featuring twins. Ako and Riko are twin sisters, and Maiku's twin is either Karen or Miina. In both of these anime, the two girls compete for the attention of one boy, who they are living with. Ako and Riko both like their brother in the same way, whereas Miina and Karen like their brother a bit differently - but the competition between them remains. So if you like your incest stories to feature twins, and to feature multiple girls competing in a harem-style over one boy, you'll like Onegai☆Twins for sure! It's cute and funny, too, just like Kiss x Sis!

Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!! is a brother-sister story with a plot twist. Nao is a junior high school girl who has incredibly strong feelings for her older brother, Shuusuke. He only sees her as a little sister, but Nao wants him to see her as a real woman. In an effort to change his taste, she raids his room to throw away any porn he has that isn't incestuous. But while searching for his secret stashes, instead she finds a photo album with pictures from Shuusuke's childhood. The only thing is, Nao isn't in any of the pictures! What could that mean for his little sister?

Much like Ako and Riko in Kiss x Sis, Nao is determined to become the girl that her older brother chooses over all the others, and will do just about anything for his attention. Nao doesn't respect Shuusuke's privacy at all and does whatever she thinks she has to win his affections, just like Keita's little sisters - none of these girls have any limits when it comes to their big brothers. Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!! is a pretty light-hearted story as well that is sure to make you laugh; while the ecchi scenes are sexy of course, they're also quite funny with how awkward they can be! If you like the fun, comedic way that Kiss x Sis deals with a taboo relationship, you'll enjoy Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!! as well.

Twins Haruka and Sora Kasugano have lost both of their parents and return to their grandparent's empty home in Yosuga no Sora. It's a town they lived in as children, so the home is full of many memories of their past. They also are returning to some old friends, as well as a few new faces too. While Nao, Akira, and Kazuha are all vying for Haruka's affections now that everyone is older, there is a much darker secret being suppressed by the twins. Sora is in love with her brother - and he might just be in love with her, too. But can that relationship ever be accepted by their friends?

Like Kiss x Sis, Yosuga no Sora is a pretty intense ecchi, featuring very heated sequences and everything short of on-screen sex. It makes this anime very appealing to fans that don't want to watch hentai but still want to enjoy a very sexy anime. Sora's feelings for her brother also mirror Ako and Riko's feelings for Keita - along with her intense jealousy for seeing him with other girls, especially ones that he is clearly flirting with. Of course, a relationship between twins is even more taboo than between a brother and his step-sisters, so Yosuga no Sora goes a step deeper into exploring an incestuous relationship. If you're looking for a sexy ecchi and even more brother-sister action, Yosuga no Sora is the perfect fit.

B-gata H-kei is the story of Yamada, a girl just entering high school. Her goal is to have casual sex with 100 different men, but two very big problems are holding her back. First, she's a virgin and worried that an experienced partner will tease her for her lack of experience. Second, she thinks her vagina looks funny! So Yamada needs a solution to her problems if she wants to achieve her goal, and finds it in classmate Takashi Kosuda, a fellow virgin. If he can be her first, he won't be able to judge her, and he can be the gateway to the other 99 men! Too bad Yamada knows nothing about flirting at all, let alone sex...

Our final choice for 6 Anime like Kiss x Sis might have you wondering why we picked it; everything else on our list has been about brother complexes and incest. B-gata H-kei has other things in common with Kiss x Sis, though! Firstly, both Keita and Yamada are completely obsessed with sex despite being virgins. It's all they think about, and they interpret everything as an innuendo. Their lust is what is driving their respective anime after all! Second, both of these ecchi are intense for ecchi. They have plenty of mild nudity and well-placed censorship to keep them from being hentai, but they are toeing the line at every opportunity. Finally, both shows treat the idea of sex in a light-hearted and comedic fashion, never letting things get too serious or dark - it's all about having fun. So if it's not necessarily the incest in Kiss x Sis that interests you but more the style of the ecchi or the characters themselves, check out B-gata H-kei next!