A Certain Magical Index, Vol. 9 (light novel) — Kazuma Kamachi

For Touma and Index, a reunion with an old ally means getting involved with one of the most dangerous objects in existence! The Book of the Law spells the end of the world, and central to this conflict is a nun who can decipher its apocalyptic contents! It's up to Touma to rescue her, but will that mark the end of his troubles...or just the beginning?