Hibiki no Sora

 is the sixth single by Yoshioka Aika.

Tracklist

 * 1) Hibiki no Sora (響ノ空)
 * 2) Hajimari no Shi (はじまりの詩)
 * 3) Hibiki no Sora (響ノ空) (Instrumental)
 * 4) Hajimari no Shi (はじまりの詩) (Instrumental)