Ako and Riko are Keita’s two year older step-sisters. Because they aren’t his real sisters, they have a lot of love for him in the most romantic way. One day after school, Ako and Riko confess their love for Keita which in time, he becomes attracted to them as well. Both anime have similar storylines. We have two siblings who fall in love with each other, the older sister is a bit more controlling, making the boy a little weak in that sense. The difference between them might be that Aki-Sora has more nudity and some R-rated sex scenes, where as Kiss x Sis is a little more soft on that subject. They both are two great anime and worth the watch.

At summer vacation, Tamotsu has taken a break from work by visiting an unusual café. It’s there where he meets Pico, a young boy who works for his grandfather, and Tamotsu falls for Pico because of his feminine looks. Pico says he’s a guy, but Tamotsu has already fallen for Pico, and from there the two will begin their sexual relationship. The similarities between Aki-Sora and Boku no Pico, is that they both have a under age boy and a older person. Of course, it is the older person who makes the first move as they fall for each other. The difference between these anime is that Boku no Pico is Yaoi. They project similar feelings which makes them the same even though it's based on the opposite gender.

Aoi Nagisa is transferred to an all-girl catholic school on Astraea Hill. It’s not easy for Nagisa to fit in, so she goes to class, joins clubs and wants to make friends. In the meantime, Shizuma Hanazono finds herself drawn to this new and exciting transfer student. AS the two begin to know each other, they decide to visit Shizuma's troubled past. Both anime Aki-Sora and Strawberry Panic take place in a high school environment where the main protagonists are drawn to each other sexually, but try to fight their urges. In the end, they both give in to their feelings for each other. The difference between them is that Strawberry Panic is more Yuri than Aki-Sora.

The schools super-idols, Arisa and Mika, are sisters and the hottest and cutest girls in the whole school. Then we have Sousuke, a normal student who like everyone other boy in school, loves the super-idols. One day, Sousuke meets with Mika and she tells him that they have just become siblings. Their parents have gotten together and their lives about about to change. In a big way. These two anime are similar in many ways. First, we have incest between the three siblings (even though they're not blood related), for it’s a love-hate relationship amongst the younger sister and the main protagonist. Second, the older sister is the only one that has love for her brother as they all live under the same roof. This is a good anime to watch if you like Aki-Sora.

Makoto Itou is a high school student who is starting his second year at Sakakino Academy. Everyday on the way to school, Makoto takes the train and meets a fellow female student he has a crush on, Kotonoha Katsura. When his new friend, Sekai Saionji, learns his secret, she wants to help him. In the end, Sekai gets jealous of the new couple due to her developing feelings for Makoto. These two anime are similar because they share the same genre of romance and school life. The main protagonist is also similar in both anime, such as, being shy at first but then grows as the story goes on.

At school, it’s time for the finals, but the tests are not the only stressful thing in Yuuta’s life. He is a high school student who is given a lot of affection from his beautiful sisters, Chiyoko and Chinatsu. Chiyoko is feminine and caring, and loves to coddle with Yuuta. Chinatsu is a cute tomboy who always seeks Yuuta’s attention by teasing him. Who will win in such a love triangle between siblings? The similarities between the two anime is they both involve a high school guy and two sisters. One of the sisters is busty, while the other is less developed in that area and the main protagonist has more feelings for the busty sister. Both Swing out sisters and Aki-Sora have slight comedy and romance in them, as well as sharing similar art style and similar relationships between siblings.