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Ao (Ishii Rika)
- Ishii Rika
- Ao (蒼; Blue)
- Catalog Number
- Kokoro (こころ; Heart)
- Aoi no Koro (蒼の頃; When I Was Blue)
- Jiro-san (次郎さん; Jiro)
"Ao" is Ishii Rika's fifth single (second indie). The single did not chart on the Oricon charts.