Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.9 | おやすみ | 3:37 | 石川優子 | accelerando | 石川優子 | Album |
| Radio City (Japanese, imprint of Radio City Record Ltd.) | RL-3044 |
| 1.9 | おやすみ | 3:37 | 石川優子 | accelerando | 石川優子 | Album |
| Radio City (Japanese, imprint of Radio City Record Ltd.) | RLC-3044 |
| 1.9 | おやすみ | 3:37 | 石川優子 | accelerando | 石川優子 | Album |
| Radio City (Japanese, imprint of Radio City Record Ltd.) | CT32-5290 |
| 1.9 | おやすみ | 3:36 | 石川優子 | アクセラランドゥ | 石川優子 | Album |
| VICL-63145 | |
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