Secret シークレット
Released April 11, 2007 Editions 3 Tracks 2
Regular edition · Regular
| 1 | Secret | A-side |
| 2 | Inner Child | B-side |
| 3 | Secret (Instrumental) |
Limited edition · Limited
| 1 | Secret | A-side |
| 2 | Inner Child | B-side |
| 3 | Secret (Instrumental) |
| 1 | Secret | A-side |
| 2 | Inner Child | B-side |
| 3 | Secret (Instrumental) |
| 1 | Secret | A-side |
| 2 | Inner Child | B-side |
| 3 | Secret (Instrumental) |