Mikuzu Sudou

Mikuzu Sudou is a young girl with the power to see ghosts and spirits known as "Oni". She is very afraid of them and men, though. When she meets Seto, he promises to protect her from the spirits for a large fee. Mikuzu, being very poor, compromises with Seto and bakes him a cake everyday. Seto refers to her as a "Kenki". She is also the only one who meets Seto's younger sister, "Seto", which results in Seto to possibly start to hate her. She has a terrible impression of Kagari, and once treated him like a dog. She does whatever she can to make sure Seto doesn't get money to keep him from getting a sex change, giving his body to his little sister. (Source: Wikipedia)