Koishi Komeiji is the Mistress of the Palace of the Earth Spirits after the underground city was separated from Hell. With Okuu and Orin as her servants/pets, she manages the ruins of the Hell of Blazing Fires where her home stands. Koishi is capable of reading the heart and mind of any living creature, even vengeful spirits. This ability doesn't work at all on her sister, Satori. She loves her younger sister, Satori, very much. Her ability to read minds causes some youkai and to fear her.