The melody is an arrangement of Overture ~Nobunaga no Yabou~, the series's characteristic main theme first composed by Yoko Kanno. Hirahara's version was specifically composed to be Nobunaga's Ambition: Sphere of Influence's image song; a shortened version of it plays during the game's credits and promotional videos. Customers who purchase the first print of the single can obtain a serial code which unlocks Hirahara as a general within the game for a limited time.