"Believe" received positive reviews from most contemporary Japanese music critics who praised the sound and likened the production values of the song.

[4][5] To promote this, they released three singles that were in support of anime series and managed to chart moderately in Japan.

[6] The song was used in promotion for the Japanese anime visual novel Fate/stay nightand was used as the ending credits for the Unlimited Blade Works series that aired in Japan and North America in late 2014.

[8] "Believe" was written by Kajiura along with composing and producing the single which she has done for the group since their debut and has a time duration of four minutes and fifty-one seconds.

[6] Member Wakana Ōtaki commented on the song; "The music and the sound is very dashing [...] and is leisurely very melodious and bright."

She stated that based on her opinion, "Believe" and the other tracks on the physical edition are inspired by ballad and soft rock music.