A total of 18 songs are included in the original soundtrack CD "Odekake Hiyori", which is a bonus for early purchasers of the package version.
The songs included are mainly the songs used in this work, and include four popular songs from the series such as "Woman on the Street". The CD label side is decorated with illustrations drawn by Yuji Himukai, who handles the character design of this work.
Album was composed by and was released on March 12, 2021. Soundtrack consists of 18 tracks tracks with duration over . Album was released by ArtDink.
CD 1
| 1 | The rail to you | | |
| 2 | 蒸気浪漫 | | |
| 3 | 青の夜景 | | |
| 4 | 水中都市 | | |
| 5 | 潮風と太陽 | | |
| 6 | 星のゆりかご | | |
| 7 | がんばるぞっ! | | |
| 8 | アフターファイブ | | |
| 9 | わいわいオフィス | | |
| 10 | Promise | | |
| 11 | 頂にて | | |
| 12 | Let's go on a journey | | |
| 13 | Let's go on a journey (Instrumental) | | |
| 14 | Let's go on a journey (KARAOKE) | | |
| 15 | ジオフロント | | |
| 16 | Trem Noturno (A9 4月のテーマ) | | |
| 17 | 扉 | | |
| 18 | 街角の女 (A7) | | |
