The only real spoiler I have is that of Azalea/Bloody August's identity. She is described as "O-FEN saiai no ane" - Orphen's beloved older sister.

However - it's not a blood relationship. She's sort of an adopted older sister. They're both orphans, and she protected him when he was small, and they both studied in the Fang Tower, where all the trouble began. So she's LIKE a sister to him, not the genuine article.

Another phrase I've encountered with respect to Azalea is " Could it be that his beloved older sister has become his worst enemy? And that it is his own fault?"