Saeki Koshiro is living with his father after a divorce that separated him from his mother and younger sister. A few long years later, Koshiro now works as a wedding planner, but unfortunately, his personal love life wasn’t planned very well because his girlfriend left him. On his way to work, Koshiro met a young high school girl on the train and after talking to her purely out of chance, something sparked within him. Is this love? And to his shock, he soon finds out the girl he met is actually his sister, Nanoka, and she is planning on staying with him and their father. Talk about awkward. Let’s start things off with an anime that’s focused more on the love than the sex. The relationship between siblings started out very awkward (grown man hanging out with a school girl in the park) but slowly developed into a less awkward story of a guy falling in love with his sister. The similarities to Aki-Sora are thin like there are no intentional panty and boob shots and no constant sex, and the act of cutting off a man’s private, but the siblings do end up falling in love and eventually the two had sex, though it wasn’t explicitly shown.

Himenokouji Akiko, 16 years of age, has moved in with her brother, Akito, after 6 long years of living apart. Over that 6 long years of being separated from her sibling, Akiko has slowly developed incestuous feelings towards her brother and it’s no surprise Akiko confessed her feelings after both were reunited. To make things a bit more complicated, Akiko loves to speak her mind and it’s not before long everyone in school knows her incestuous love towards her brother Akito. While the anime isn’t as, let’s just say, boisterous as Aki-Sora, the main story of OniAi is focused on the love between siblings and our lovable Akiko who wants more from her brother other than hugs and kisses, much like Aki wanted (or did) with her brother Sora. Unfortunately for Akiko (aside from numerous girls also aiming for Akito), her brother Akito doesn’t see her as someone romantically being with, but eventually their relationship soon develop as the story progresses.

Suminoe Keita has new step-siblings, Ako and Riko, after their parents remarried. As it turns out, the twin sisters find Keita attractive in a sexual way, but Keita disliked the idea of getting romantically involved with his new step-sisters. All that changes when the three siblings entered the same high school and Keita couldn’t stand seeing the boys making moves on his beloved sisters. Keita wants Ako and Riko for himself and the best part is their parents totally approve! “Don’t worry and go for it!”, right!? Yeah, Keita isn’t related to the twins, but the two sisters make out a few times in the anime, so that’s incest of the yuri kind. Still, Keita at first considered the twins to be his siblings because they’ve been together since childhood, but like any growing boy of his age, priorities change, and man, things don’t let up in Kiss x Sis. If we’re gonna nitpick, Kiss x Sis is similar to Aki-Sora in a lot of ways such as both shows involving a love triangle, Ako and Riko are twins just like Sora and Nami, and all are in love with each other and they’re sexually aggressive about it. But the biggest similarity is both shows are very perverted and lustful. There is no sex in Kiss x Sis, but in terms of the number of lewd things they do every single day rivals that of Aki-Sora where Aki dresses Sora as a girl, gives Sora a blowjob out in the open and have sex in the school’s tool shed.

On the outside, Kousaka Kyousuke seems to be the luckiest brother on Earth for having a sister who is smart, athletic and is a professional model. Aside from her impressive resume, Kirino at home is a bratty girl, a hardcore otaku who collects figures, likes little anime girls, and reads erotic visual novels, and suddenly, both siblings stopped talking to each other like they don’t exist. During one quaint afternoon, Kyousuke found out his little sister was reading pornographic stuff and in that very moment, their silence broke for the first time. Kirino then convinced Kyousuke to help hide her double life from her friends and everyone else, including their parents, while helping her do some otaku stuff. Your mileage with this anime varies due to a lot of factors. First, is Kirino is one insufferable girl, like an overpowered tsundere that you may find unlikable. Secondly, you’re gonna hate this show because you were rooting for Kuroneko to win. If there’s a third factor, it's that the incestuous part won’t show up for a while, as in wait until the sequel. That aside, the story is centered around Kyousuke helping out Kirino. Initially, Kyousuke is helping cover Kirino’s otaku tracks but slowly turned into Kyousuke emotionally supporting Kirino like any big brother would do. For the actual incest, things develop around the 2nd season with the two getting married, kissed and the heavy implications that they had sex. According to the light novels, at least. Though not as sexually explicit like Aki-Sora, the story of two siblings ending up together and having sex is still pretty similar to Aki-Sora. Sorry, Kuroneko, fans.

Iku and brother Yori are very close twins since they were young and, at one time, Yori told his parents that one day he would marry his sister Iku. His declaration of marriage may sound playful and innocent like any other kid, but that declaration came back to his teen years and it’s been haunting him since. He can’t stand looking at Iku without any romantic or even sexual thoughts, and it reached the point that Yori no longer sees Iku as a sibling. Yori began avoiding Iku by all means, but things are getting way worse because not only can Yori, still, not control his emotions, he ended up hurting the feelings of his one and only sister. So what happens when your twin sister is one hot girl, clingy towards you, both of you sleep in one room, steals your top bunk once in awhile for a snooze as you just hit puberty? Raging hormones, that’s what! Boku wa Imou—let’s just call it “BokuImo”—tells a more serious side of incest romance and it’s more realistic than Aki-Sora’s pacing, plus a dab of religion. However, the fundamentals are still similar: two siblings fell in love and while there are some ups and downs, like questioning what is moral or immoral, the two sealed that forbidden love with one intimate night together.

Twins Kasugano Sora and Haruka are returning to the countryside to start a new life after their parents died from a freak car accident. There they meet with childhood friends and their new life begins, but little does everyone know, the twins carry a secret and forbidden relationship behind closed doors. Yosuga no Sora tells the story of a pair of twins’ bond, love and sexual discoveries. Like Aki-Sora, the story is centered around incest, and again like Aki-Sora, there are a lot of sex scenes. In addition, Yosuga no Sora isn’t categorized as hentai. At first, the show typically starts off with the twins settling in their new home, meeting new friends, and Sora finding new love among his classmates, etc. Before the story progresses to a typical romance story, the anime grinds to a halt and retconned itself to divert the story focusing on the twins. Things start getting crazier as the twins begin lusting for each other’s bodily fluids and at one point when they couldn’t contain their lust, they ended up getting caught by one of their friends!! Yosuga no Sora really defined the phrase “F**k like rabbits.”