I've red the manga, and I quite enjoyed it. I think the author handles it well, considering how difficult the subject of love between a brother and sister is. It never gets disgusting, which I think alot of stories like this could easily get... Neither does it try to preach one way or the other, it just represents a somewhat unnerving but very believable story, it's characters, and their decisions.
The anime isn't bad either. I also like Nanoka's seiyuu.
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