The game's theme song, "Believe in the Spirit", was composed, written and sung by Japanese singer-songwriter Kokia. Prior to coming on board, she had little knowledge of the "Mana" series. As with her previous compositions for video games, Kokia tried to get a feel for the game's atmosphere before starting, either through playing the game directly or looking at behind-the-scenes material related to the game's world. With "Believe in the Spirit", she worked to create a song that would appeal to both players and the production team. The track was performed using strings, a tin whistle, an acoustic guitar and percussion. The arrangement was done by Mina Kubota.