Tracks
| # | Title | Sung by | |
|---|---|---|---|
| 1 | Letter | 伊波杏樹 | 4:58 |
| 2 | Day by Day | 伊波杏樹 | 4:16 |
| 3 | ASSO。 | 伊波杏樹 | 3:08 |
| 4 | Letter –Instrumental– | 伊波杏樹 | 4:58 |
| 5 | Day by Day –Instrumental– | 伊波杏樹 | 4:16 |
| 6 | ASSO。 –Instrumental– | 伊波杏樹 | 3:06 |
Member reviews
Source: MusicBrainz release group b56039dd-8bf1-4881-b468-4ceec74417fa (CC0). Cover: Cover Art Archive.