It's special CD from the BD releases of Kyoukai Senjou no Horizon II. I'll try to update the post. This is not my upload but a link a found in 4chan. Thanks the original uploader.

Kyoukai Senjou no Horizon II Special CD 1 APE
http://www.mediafire.com/download.php?3nxfz9xxh332jwh

Kyoukai Senjou no Horizon II Special CD 2
http://www.mediafire.com/download.php?26v44uu43boxx14

Kyoukai Senjou no Horizon II Special CD 3
http://www.mediafire.com/download.php?pb9r4e4jq326oor

The third special CD is by far, still my favorite. Have fun with the with it.