What I kept thinking is that this manga is a perfect shoujo manga due to its romance. It weirded me out at first but you learn to deal with it after the first 5 chapters, when you just can't seem to stop reading^^
Don't be fooled by the synopsis. The gender bender isn't really the main plot in this. It's sis x bro love just to warn you. Actually I think the plot would have been no different without the gender bending involved but don't get me wrong, it's still a good essence to the story; all the more reasons to why he loves her.
chapter 1, their both joking about the idea of liking each other like that. But we all know that joke is heading straight for the actual thing. Does this mean this manga is a taboo? Don't worry it's unrelated incest; but still it's kind of creepy since it's still morally wrong. The main general plot of this is forbidden love and of course they want acceptance in their relationship; show it to their heart's content in front of everybody if possible.
Lovely art, no different from your typical shoujo kind of art. The girl is cute looking and the guy is hot. nuff said there~
Character - 6/10
The main reason why the rating is low because it's very unrealistic. Chihiro liked her ever since he was a little kid. Seems a little far fetched? I mean did his parents not teach him that it's just wrong to love your siblings as a potential lover? I think he loves her a little too much, well I guess this does fulfill the role of a shoujo manga since the guy is something girls would fall for and be the perfect boyfriend that would always be faithful. His persistency in her makes you wanna go "uhhh..? weirdo! awww" Or at least that's how I felt.
Ami is his sister but her character developes into loving him. Of course you would have mixed feelings about whether or not you're able to love your sibling. She gets a little indecisive but I would be pretty creeped out that all of a sudden your brother goes all goo-goo-ga-ga over you (lol did i actually say that?).
To make the plot interesting, the mangaka always has to add characters to get in the way or else the plot would come out smoothly.. who the hell wants to read that?
Enjoyment - 9/10
Ok I'm the kind of person who loves reading cheesy lines and romantic stuff. If you basically like shoujo then you should consider this. At times it can get predictable but it's generally a happy story with not much tragedy. There's not much drama as I anticipated but it was a such a cute light manga to read.
The average of all my scores turns out to be an 8 anyway; but besides that it deserves a good solid 8. Only problem it was too short. 17 chapters?! lolwut. Finished that in 5 days flat. Trust me if a manga didn't really interest me, I wouldn't read it so quickly. The last chapter ended so abruptly and it went straight to the future when some questions were still unsolved.