Quick answer — Aoi Hiiragi worked on Whisper of the Heart (Original Creator), The Cat Returns (Original Creator).
OP
Whisper of the heart- {John Denver}
ED
A Whisper of the Heart - Ending Theme
OP
The Cat Returns - "Kaze ni Naru" Romaji + English Translation Lyrics #3
ED
The Cat Returns - "Kaze ni Naru" Romaji + English Translation Lyrics #3
Frequently Asked Questions
What anime has Aoi Hiiragi worked on?
Aoi Hiiragi worked on Whisper of the Heart (Original Creator), The Cat Returns (Original Creator).