| Track Name | Track Artist | Album Artist | Album Name | Official Purchase/Artist Link | Album Genre | Source Track(s) |
|---|---|---|---|---|---|---|
| 緋色の雨、終始、 | 村瀬悠太 | Crain | Ancient Citizen | Link | 幼心地の有頂天 | |
| 天の上の戯曲 | ふぃね | Crain | Ancient Citizen | Link | 幼心地の有頂天 | |
| 天ツ国の降塵 | 芙爾沙夜 | Crain | Ancient Citizen | Link | 幼心地の有頂天 | |
| 常ノ国の眠り | ne_Sachirou | Crain | Ancient Citizen | Link | 有頂天変 ～ Wonderful Heaven | |
| 有頂ノ夢 | ふぃね | Crain | Ancient Citizen | Link | 幼心地の有頂天 |