The series got off to a hot start, in all senses of the word. The relationship between Sora and his sister Aki was immediately sexual, highly erotic, and yet very endearing. Their love for each other is very clear. And on top of that, they were caught in a dangerous love rectangle, with their secret in danger of being exposed. Aki seems to take this threat lightly; Sora does not. Nami, their sister (and Sora's almost identical looking twin), undergoes character conflict as she repeatedly finds herself the third wheel (although she doesn't quite know how far apart she is from her siblings) and is also jealous of Sora for the crush that another girl, Kana (this time not a member of the family) has on him.
All in all, this set up holds tremendous potential. Too bad the author seems to be gearing this series more as hentai than a drama/romance with sex.
In chapter 4, another character, Runa, gets thrown into the mix. In her first appearance, she is also pretty endearing. Her endearing qualities seem to vanish in the sixth chapter where she does something that, frankly, is pretty unforgiveable. I won't reveal the details of what, exactly, but she's basically counting on "all men are perverts" with Sora. Not to mention, it felt like a serious betrayal of her character considering that she had been careful in the past and yet lets the cat out of the bag suddenly and dangerously, forcing Sora into a position he'd probably rather not be in along with her.
If you're looking for hentai billed as just another seinen mag, then you might actually like the direction the manga seems to be heading in as of chapter 6, but if the plot is of interest to you, then you will probably feel a little betrayed.
I won't rate it for now; I'll at least wait until I see what direction the author takes it in.
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