An eighteen-year-old Japanese sorceress from Necessarius. Unlike her partner, Stiyl Magnus, she uses magic to magically strengthen her body. Her sorcery name is Salvare000, "The one being saved becomes the hand that saves".
She uses a two-meter-long ootachi called Shichiten Shichitou ("Seven Heavens Seven Swords") as her weapon. She has a special attack called Nanasen that uses her sword and thin steel wires.
She used to be a kind woman who treated Index like a sister, but when Index's memories were deleted by Necessarius, Kaori changed into a cold and silent woman as Index no longer remembered her and consequentially did not trust her. After Kamijou Touma saves Index's life and her current memories, she decides to let Index stay at Academy City as she feels Touma can protect her.
