The battle over Orsola, the only nun who can read the Book of Law, continues as Toma is forced to act as an unwitting decoy. The Amakusa clash with church representatives, but the real culprit behind the plot might not be who Toma expected.
Index is still a fugitive, and many powerful magical organizations and individuals want to take her to use the books in her memory, eliminating her in the process. War between those organizations is also starting to emerge. Index can only rely on her friend Touma, who has always protected her, along with Misaka and other friends from the Academy.