Niji no Yakusoku

 is the fourth single by Komatsu Mikako. It was released on December 25, 2013, and peaked at #37 on the Oricon single chart.

Information
The lead track was used as the theme song for the anime Majocco Shimai no Yoyo to Nene, while the instrumental for Track 2 was used as background music in the anime.
 * Lyrics: Komatsu Mikako (Track 1, 2, 3), Hirao Takayuki (Track 1), Shiina Go (Track 1, 2)
 * Composition: Shiina Go (Track 1, 2), Hoshino Junichi (Track 3)
 * Arrangement: Yo Keigo (Track 1), Miyano Sachiko (Track 2), Hoshino Junichi (Track 3)
 * Brass/Strings Arrangement: Tateyama Akiyuki (Track 1)

CD

 * 1) Niji no Yakusoku (虹の約束)
 * 2) Dear My Wish
 * 3) Always (Limited Edition Only)
 * 4) Niji no Yakusoku (虹の約束) (inst)
 * 5) Dear My Wish (inst)
 * 6) Always (inst) (Limited Edition Only)

Limited Edition DVD

 * 1) Niji no Yakusoku (MV)