The crow is seen as an ominous bird not only in Japan but also in Europe.
The edge of wake up is right before you wake up. And, by wake up I mean you're about to wake up to the truth. But, you're only at the edge, so for now what you see is an omen... an omen that will show the truth.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Just remember that 起 is rendaku'd and becomes ぎ here.