Kimi no Kokoro wa Kagayaiteru kai? (君のこころは輝いてるかい？ lit. Is Your Heart Shining?) is Aqours' first single. It was released on October 7, 2015 on both a CD and Blu-ray disc or DVD.
The lyrics is written by Hata Aki, the song is composed by Mistumasu Hajime and arranged by EFFY.