Ruri no Sora e

 is the 18th single by Yoshioka Aika.

Tracklist

 * 1) Ruri no Sora e (瑠璃ノ空へ)
 * 2) Tokiwa Hi (常盤火)
 * 3) Izayoi Namida (十六夜涙) ~Acoustic Live Version~ (from 2014 "AIKA’S BEST" Launch Acoustic Live)
 * 4) Ruri no Sora e (瑠璃ノ空へ) (Instrumental)
 * 5) Tokiwa Hi (常盤火) (Instrumental)