Sister Contrast! First Press Bonus CD - Possibility
| Composed by | Shinji Hosoe |
| Arranged by | Shinji Hosoe |
| Published by | AcaciaSoft |
| Catalog number | AS-0001-3 |
| Release type | Game Soundtrack - Promo / Enclosure |
| Format | 1 CD - 3 tracks |
| Release date | November 21, 2003 |
| Duration | 00:09:32 |
| Genres |
| 1 | Possibility (Long) | 03:39 | |
| 2 | Possibility (Karaoke) | 03:39 | |
| 3 | Possibility (Short) | 02:14 |
