Tracks
| # | Title | Sung by | |
|---|---|---|---|
| 1 | 約束 | Duca | 4:35 |
| 2 | 想い出のパズル | Duca | 4:48 |
| 3 | 約束 (instrumental ver.) | Duca | 4:34 |
| 4 | 想い出のパズル (instrumental ver.) | Duca | 4:44 |
Source: MusicBrainz release group db1f7d48-3510-49d4-9d3c-4188a4c1a997 (CC0). Cover: Cover Art Archive.
| # | Title | Sung by | |
|---|---|---|---|
| 1 | 約束 | Duca | 4:35 |
| 2 | 想い出のパズル | Duca | 4:48 |
| 3 | 約束 (instrumental ver.) | Duca | 4:34 |
| 4 | 想い出のパズル (instrumental ver.) | Duca | 4:44 |
Source: MusicBrainz release group db1f7d48-3510-49d4-9d3c-4188a4c1a997 (CC0). Cover: Cover Art Archive.