Kokoro wa Shoujo de Parachute
心は少女でパラシュート
The heart is a girl's parachute
From Azumanga Daioh Character CD Series Vol.2 Sakaki-san
Performer: Sakaki (CV. Yū Asakawa)
Composer: Masumi Ito
Arranger: Masumi Ito
Lyricist: Aki Hata
https://vgmdb.net/album/92683