What is this song?

[Jasoun]

Hey there; sorry if this is in the wrong place, but I've been trying to figure out what song is featured in this video: http://www.youtube.com/watch?v=FjdPbbvj1aI It just sounds familiar, an opening to something... it's just... argh.

[shadow22619]

I'm pretty sure this was an opening of Blood+.

Edit: Aozora No Namida Blood+ Opening 1

[~OTAKYU~]

shadows right! its blood + op 1!
SPOILER:
i hated the part where riku dies :curses: :curses: :curses: :curses: