TRINITY: Souls of Zill O'll (トリニティ ジルオール ゼロ, TRINITY Zill O'll Zero) is a prequel that takes places five years before the original game. The producer for the game is Akihiro Suzuki while Tomohiko Sho is director. Shinsuke Sato served as the story writer and Yoshihiro Ike composed the music. The theme of this title is "bonds", as in the ties shared between people.