| Track Name | Track Artist | Album Artist | Album Name | Official Purchase/Artist Link | Album Genre | Source Track(s) |
|---|---|---|---|---|---|---|
| UNDERGROUND GARDEN | HRK | DREAMERS GARDEN | UNDERGROUND GARDEN | Link | ハートフェルトファンシー | |
| opened | HRK | DREAMERS GARDEN | UNDERGROUND GARDEN | Link | 少女さとり ～ 3rd eye | |
| closed | HRK | DREAMERS GARDEN | UNDERGROUND GARDEN | Link | ハルトマンの妖怪少女 | |
| 3rd cycs ～ Double Helix | HRK | DREAMERS GARDEN | UNDERGROUND GARDEN | Link | 少女さとり ～ 3rd eye; ハルトマンの妖怪少女 |