Kurumi is Tokisaki Mana spirits Takamiya was killed several times in the past, but just copy all of Kurumi Zafkiel created by angels, with a price to pay is the "time" of her, so she began to take away the "time" of man.
Tokisaki Kurumi first appeared in the novel and anime episode 3 episode 7 Once introduced herself has said that she is a self-spirit, and she expressed a special interest for Itsuka Shidou first sight first.
Tokisaki Shidou Kurumi is described as "a staggering beauty", because after the class Shidou see her face immediately loudly, do not even pay attention to her next words confirmed himself as a spirits. She has something very elegant strokes and behave properly.