Warning: this review may contain spoilers.
First impressions: So when getting into this manga, I was a little skeptical to review it because of its somewhat controversial nature dealing with rape, incest, orgies, etc. But I will try my best to review it.

Story, 6/10
"Love is a thing that comes in many forms"
"But what happened when your love is a taboo in society?"
The story begins with Sora who is starting to come to terms with the fact that he is in love with his older sister, Aki. While trying to hide this fact, he finds out that Aki also loves him through a very awkward bath time experience and a heart to heart chat which eventually leads to sex. At this point, both of them decide to began there relationship together.

So Aki-sora is basically an ecchi drama with a taboo relationship added in for more flavor. It's centered around the main character trying to come to terms with the fact that he and his sister are in love with each other and are in this incestual relationship, while trying to hide it from every one else.

So we have this romance story about incest which would turn a lot of people away. Which I can kind of understand a bit. But personally, I don't really mind because for me it not what is in a story that counts; rather, it's what they do with it that counts. For the most part Aki-sora does do an okay job at presenting this taboo relationship.
They took it seriously enough that it has some very genuine moments within it, and it actually looks like they both care for each deeply. But I would like to add before I continue this review that I am in no way promoting the idea that any of you try and fuck your family members.

But like all those who pursue forbidden fruit, they eventually get the consequences of what such a “relationship” would offer. However, I would probably use that word loosely. But this taboo relationship becomes almost like flavoring at some points because the story decides to throw in a harem so that every one can get on the main character's mighty sword.

Literally right after he starts going out with his sister, Sora gets dragged into all these crazy sexual situations, like meeting a girl who is an exhibitionist, getting into a sexual relationship with his twin sister's best friend, getting raped by his twin sister, getting involved in an orgy, and also having sex with one of his friends girlfriend twice. So It's really over the top with its fan service, which didn't bother me that much because I quite like ecchi and fan service and all that other stuff. But the problem with it is that this story has quite a bit of quote unquote "mature" content in it.

Because this show does have incest as a main theme, which is quite serious I might add, its nice that this story took that aspect at least a little bit seriously. However, I couldn't take this story seriously because of all the other stuff that is going on in the background. I mean if you are in “love” with someone, you generally don't have casual sex with a bunch of other people while in a serious relationship. Or maybe that's just me because I was raised in a old fashioned household. Maybe this is some new social practice which I haven't heard of before.

However, one positive regarding this aspect in particular is that it seems to show you some of the different ideologies that people have when it comes to relationships with the main character by exploring some those different ideologies with some of the different characters in the story. So that was kind of interesting. Although they really don't to much with it.

However, when I think about it, this is an ecchi story, so I shouldn't take it too seriously. But it's interesting for an ecchi show to have some kind of serious aspects to it. So I give credit where it's due.

But the final nail in the coffin is the ending. It basically ends open to interpretation. I feel there was going to be more story, but never got the chance to get there. Afterwards, I found out that it actually got cancelled. So I guess that explains it.
But I still feel that it was incomplete. But even if that were the case, a good writer would actual take that into consideration when trying to wrap it up. Not saying the writing was bad… Ok, to be honest, the writing was pretty meh as a whole.

Characters, 5/10
So the Main character can be pretty much described as a person who has got a sister complex and is some what of a push over. However, I did like the fact he was somewhat realistic in his reaction to him being in these some what sexual situations with a lot of these girls that we meet. Because let's be honest- wouldn’t most men his age do a similar thing he was doing if they got Into those situations?

The side characters are pretty basic in personality and I wouldn't say generic; rather, it's just that they feel very unnatural to me as characters. Although, it is probably because they are involved in situations that isn't your every day kind of thing. But they do add some psychoanalysis to the characters in order to add some depth to them, which I quite liked. But other than that there really isn't much to them.

But I really liked the whole thing about Sora's twin sister Nami and her best friend because it basically shows you what jealousy can actually do to a person and how you shouldn't try to pursue a relationship when you have been in the friend zone.

Art, 6/10
So the art work for Aka-sora Is pretty average. The nsfw scenes were nicely drawn. The backgrounds were okay for the most part. The character designs are also generic.

Enjoyment, 5/10
So for Aki-sora I kind of liked it for what it was. But at the same time I don't know whether to hate it or the like it, so I liked that it was somewhat different I guess. And that's not a bad thing. But in all honestly, if you going to do something like this, I think it better if you try a bit harder to make your story better written.

Overall,6/10
If you are a person who has strong morals then I recommend that you stay away from this and read something different. But if you are a person that likes ecchi then you will probably like it a bit, I guess. But in all honesty this would have been better as a hentai instead of an ecchi/drama/whatever tags it has.