Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.8 | Oh Baby | 4:07 | AZU feat. 草川瞬 | Two of Us (初回生産限定盤) | AZU | Album |
| Ariola Japan (Japanese label, 2009–present; rebranded from the entirety of BMG Japan in June 2009) | BVCL-83 |
| 1.8 | Oh Baby | 4:07 | AZU feat. 草川瞬 | Two of Us | AZU | Album |
| Ariola Japan (Japanese label, 2009–present; rebranded from the entirety of BMG Japan in June 2009) | BVCL-85 |
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