A3! FIRST AUTUMN EP
| Composed by | R·O·N / Reiji Okii |
| Arranged by | R·O·N / Reiji Okii |
| Published by | Pony Canyon |
| Catalog number | PCCG-01603 |
| Release type | Game Soundtrack - Official Release |
| Format | 1 CD - 8 tracks |
| Release date | June 28, 2017 |
| Duration | 00:30:01 |
| Genres |
| 1 | oneXone | 03:37 | |
| 2 | 一夜限りの相棒 | 03:06 | |
| 3 | スーパーウルトライージーモード | 03:58 | |
| 4 | LONER | 04:21 | |
| 5 | oneXone (INSTRUMENTAL) | 03:37 | |
| 6 | 一夜限りの相棒 (INSTRUMENTAL) | 03:06 | |
| 7 | スーパーウルトライージーモード (INSTRUMENTAL) | 03:58 | |
| 8 | LONER (INSTRUMENTAL) | 04:18 |
