Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 2.1 | プロローグ | 5:03 | 伊藤咲子 | 伊藤咲子COMPLETE BOX | 伊藤咲子 | Album + Compilation |
| EASTWORLD (Japanese imprint) | TOCT-28001, TOCT-28002, TOCT-28003, TOCT-28004, TOCT-28005, TOCT-28006, TOCT-28007, TOCT-28008, TOCT-28009 |
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