Eimu Yoake

The main heroine. Eimu first appears as a bodyguard forced to protect Yuu. Later into the series, Yu and Eimu develop a bond in which she later chooses for herself to protect him. Eim has two Ayakashis, Akuro-ou, a large, blue Ayakashi and Satori, a small blue and white Ayakashi with the ability to fight and read minds. (Wikipedia)