Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.3 | きっと | ?:?? | Spontania feat. 橋本聖子 | 夏夢 | Spontania feat. Sotte Bosse | Single |
| Far Eastern Tribe Records | UMCF-5040 |
| 1.12 | きっと | 4:34 | Spontania feat. 橋本聖子 | Collaborations BEST!! | Spontania | Album + Compilation |
| Far Eastern Tribe Records | UMCF-1027 |
| 1.12 | きっと | 4:34 | Spontania feat. 橋本聖子 | Collaborations BEST!! (Limited Edition) | Spontania | Album + Compilation |
| Far Eastern Tribe Records | UMCF-9522 |
| Pseudo-Release | |||||||||
| 1.12 | Kitto | 4:34 | Spontania feat. Seiko Hashimoto | Collaborations BEST!! | Spontania | Album + Compilation | |||
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