Orthros no Inu ORIGINAL SOUNDTRACK
| Composed by | Akio Izutsu |
| Arranged by | Akio Izutsu |
| Published by | HARBOR RECORDS |
| Catalog number | NQCL-2028 |
| Release type | Game Soundtrack - Official Release |
| Format | 1 CD - 22 tracks |
| Release date | September 09, 2009 |
| Duration | 01:14:29 |
| Genres |
| 1 | オルトロスの犬 | 07:14 | |
| 2 | 双頭 | 03:11 | |
| 3 | 混沌 | 03:14 | |
| 4 | The Light of Darkness | 07:09 | |
| 5 | オルフェウスは振り返る | 04:07 | |
| 6 | God Hand | 02:28 | |
| 7 | テレプシコーラ | 03:45 | |
| 8 | White Breath | 03:07 | |
| 9 | タナトスの谷 | 02:44 | |
| 10 | Aria X | 03:43 | |
| 11 | 真偽 | 03:07 | |
| 12 | ウラノスの豪雨 | 03:25 | |
| 13 | キュプリア | 02:26 | |
| 14 | Nitro | 02:16 | |
| 15 | Cast Off | 02:21 | |
| 16 | Mercy | 04:23 | |
| 17 | Punch Line | 02:28 | |
| 18 | クロトの紡ぎ糸 | 02:23 | |
| 19 | 臨界角 | 02:42 | |
| 20 | The secret Key | 02:45 | |
| 21 | エキドナの過ち | 02:57 | |
| 22 | The Hole of Darkness | 02:34 |
