Komoe successfully helps Index heal her wounds using an ancient magic ritual but asks Toma the next morning who she is. When he lies that she is his sister, Komoe spots the fib immediately but decides not to press the issue since she believes it is something he must solve on his own. While Komoe is out, Toma learns about Necessarius (the organization that Index belongs to) and that the Index-Librorum-Prohibitorum was implanted into Index's mind so that she would be a living library for the church, since reading the originals would curse and taint people. Meanwhile, Stiyl and Kaori Kanzaki continue to watch Index and comment on how her happiness will be short-lived. When Toma and Index get into a fight and separate, Toma finds himself in an empty street and meets a girl wielding a nodachi: Kaori Kanzaki.