Toaru Majutsu no Index Light Novel Volume 09 was first published on April 10, 2006. It features once again the Roman Catholic Church as antagonists, represented by Lidvia Lorenzetti, as they try their nefarious plot during the Daihaseisai, forcing Touma to intervene. The novels marks the first time the story is separated in two parts, with the next novel continuing where this novel left off.