Itsuka Mita Niji no Sono Shita de

 is the fifteenth single released by Afilia Saga. It was released on March 2, 2016. It came in five editions, 4 regular and 1 DVD. It was the last single to feature Louise Sforzur, and the first single to feature members Kaori S Godland, Kana R Norwich, and Yumi W Klein.

DVD Edition CD

 * 1) Itsuka Mita Niji no Sono Shita de (いつか見た虹のその下で)
 * 2) Kira Kira Radio (キラキラレディオ)
 * 3) Castaway～神話が生まれるよりずっと前から～
 * 4) Itsuka Mita Niji no Sono Shita de (off vocal)
 * 5) Kira Kira Radio (off vocal)
 * 6) Castaway～神話が生まれるよりずっと前から～ (off vocal)

DVD

 * 1) Itsuka Mita Niji no Sono Shita de MusicClip
 * 2) 特典映像

Regular A & B CD

 * 1) Itsuka Mita Niji no Sono Shita de
 * 2) Kira Kira Radio
 * 3) Itsuka Mita Niji no Sono Shita de (off vocal)
 * 4) Kira Kira Radio (off vocal)

Regular C & D CD

 * 1) Itsuka Mita Niji no Sono Shita de
 * 2) Castaway～神話が生まれるよりずっと前から～
 * 3) いつか見た虹のその下で(off vocal)
 * 4) Castaway～神話が生まれるよりずっと前から～(off vocal)

Featured Members

 * Ayami Chercy Snow
 * Alice Rozen
 * Kaori S Godland (Debut)
 * Kana R Norwich (Debut)
 * Kohime Lit Pucci
 * Nana Dorp Bijou
 * Maho Sotto Voce
 * Miku Doll Charlotte
 * Moe Mieray
 * Myuna Shulita
 * Momoko Little Berry
 * Yukafin Doll
 * Yumi W Klein (Debut)
 * Love Berry Janne
 * Louise Sforzur (Last)