Amano had started creating the song under the name "Tattoo" before being contacted, and during the writing process altered the song to better fit the game and renamed it "Voice". She based the song around moving on from grief, with a close friend having lost her fiancée in real life. There was a slight mismatch between the lyrics focusing on moving on and Shibata's wish for a song about remembrance, which caused friction between Amano and Shibata that Kikuchi needed to resolve.
Amano began composing "Voice" under the working title "Tattoo," but later tailored it to fit the game, renaming it. She drew from her own emotional experience of overcoming sorrow after a close friend's fiancé passed away. Nevertheless, there was a clash between Amano's emphasis on moving forward and Shibata's preference for a song about remembrance, which caused friction that Kikuchi had to resolve.