The promotional video to the opening song of Blood+: 「Aozora no Namida」 by Takahashi Hitomi.
This song has been getting better everytime I listen it, so I was really looking forward to see the PV. It features part animation, part CG, and part Takahashi Hitomi (ie. real life..kind of). We see Saya fight a couple of Chiropterans, and get injured by the second one. Her sword goes flying into the real world, and Takahashi Hitomi picks it up and uses it to kill the monster. She then goes above ground to a world full of them, and her eyes glow red. It only occurs to me now that she looks almost a bit like Saya with that short haircut of hers. So I really enjoyed watching it (as you folks may know, I like my PVs with mini-stories).
A big thanks to doobie for finding this PV.