"Keys～時を結んで～"
Lyrics/Vocal: Mar.na
Composer/Arranger: Kotaro Kusuno
BGM: cocoronobeat Entertainment
Theme Song Music Box ver: Kotaro Kusuno
Theme Song Piano ver: Jim-K
Album was composed by cocoronobeat Entertainment / Kotaro Kusuno and was released on October 27, 2017. Soundtrack consists of 20 tracks tracks with duration over about 55 minutes. Album was released by Omochi Soft.
CD 1
| 1 | Every day adventures | 01:25 | |
| 2 | After noon tea. | 02:11 | |
| 3 | Fascinating princess | 01:54 | |
| 4 | A healthy princess | 01:10 | |
| 5 | A solid princess | 01:43 | |
| 6 | Relief | 01:25 | |
| 7 | Love is truth | 01:42 | |
| 8 | Conflicting princess | 02:04 | |
| 9 | Answers to guide and lead | 01:28 | |
| 10 | ランスロール大陸 | 02:15 | |
| 11 | Fascinating princess ～sweet ver～ | 02:06 | |
| 12 | A healthy princess ～sweet ver～ | 01:28 | |
| 13 | A solid princess ～sweet ver～ | 02:12 | |
| 14 | Keys ～piano ver～ | 07:29 | |
| 15 | Keys ～orgol ver～ | 06:12 | |
| 16 | Keys ～Harp ver～ | 05:38 | |
| 17 | Keys | 03:51 | |
| 18 | Keys ～時を越えて～(short ver.) | 01:22 | |
| 19 | Keys～時を越えて～(カラオケ版) | 03:51 | |
| 20 | Keys～時を越えて～(フルコーラス版) | 03:51 | |
