Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.6 | No.51 | 4:27 | Duca | heart to heart ～from iyunaline to solfa2～ | solfa | Album + Compilation |
| Marble Sky Records | MSRC-042 |
| 2.9 | No.51 | 4:27 | Duca | solfa 15th Anniversary Premium Music Box: GO BEYOND | solfa | Album + Compilation |
| Marble Sky Records | MSRC-130, MSRC-131, MSRC-132, MSRC-133, MSRC-134 |
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