Niji no Yakusoku

"" (虹の約束) (Rainbow Promise) is the 2nd ending theme for Future Card Buddyfight Ace, which is performed by Shūta Morishima.

iTunes
The song "" is available to download from iTunes on November 3rd, 2018. The following tracks were available:
 * 1. 虹の約束
 * 2. 虹の約束 -instrumental-