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 initially crafted the song under the moniker "Tattoo," but later refined it to align with the game, rechristening it "Voice." She drew solace from her own personal struggle of coping with grief following a close friend's loss. However, there was an incongruity between Amano's focus on healing and Shibata's aspiration for a song about commemoration, which led to discord that Kikuchi had to reconcile.