An eighteen year old sorceress from Necessarius. Unlike her partner Stiyl, she uses magic to magically strengthen her body. Her sorcery name is Salvere000. She use a 2 meter long katana (which actually is a Nodachi) called "Seven Heavens Seven Swords" as her weapon. She has a special attack called Nanasen (七閃, Nanasen? "Seven Flash") that uses her katana and some 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 Tōma saves Index's life and her current memories, she decides to stay at Academy City to be with Index and protect her.