This is a great, mature manga. Each chapter has a deep meaning that makes one contemplate. Read it slowly with an open mind, and you will not regret it. Remember, it is the author that decides what happens, not you, a right she has since she was the one that created the characters and the setting. There are not a lot of stories as well-done as this one.
The main male character is too feminine for my taste, and yes, the way the characters are drawn from a distance does make them look a little fat sometimes, but how almost each chapter leaves one thinking is simply amazing. Although the story may appear stand-alone or thw most part, the plot does progress, without the reader feeling or even needing it to, a sign of an expert mangaka.
Somebody complained that the protagonist, Sora, does not feel guilty after engaging in sexual relations with other girls, that he and his sister, Aki, do not have hesitation towards being intimate with each other, and that Aki does not feel special, however, I strongly disagree.
Every time that Sora was involved with another girl, it was because either he was forced, begged, or cornered. Remember, he was pushed to be with Kana, his shy classmate who likes him, by his tough twin sister, Nami, and he was officially available. It is not like Sora could just say, 'Sorry, guys, you see, my sister and I are "together," so I can't see anyone else.' At first, he thought that being with Aki is wrong, but he just could not answer her question, 'Why?' Their relationship's being taboo and how long it would last is also explored multiple times, such as in the chapter The Red Thread of Fate, where they think about having sex while tying a thread to their fingers at a temple, and the legend says that the couple is doomed if it rips. Sora also has feelings reserved for Aki. She occupies his thinking. Satsuki Runa, the girl who goes to the same school and lives in the same building as Sora, notices a few times as well that there is a girl that he loves. Further, Aki displays signs of jealousy of Nami and Kana sometimes. However, what she does not know can not hurt her.
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