The 16-year-old Maron Kusakabe is usually a normal high school student, but she can transform, with the assistance of the angel Finn Fish, into the reincarnation of Jeanne D'Arc in order to hunt demons, which hide themselves within works of art. If a demon is defeated, the associated work of art disappears, which is why she is called a kaitÅ ("phantom-thief").
Maron's best friend is Miyako, the daughter of a diminutive police detective who aims to arrest Jeanne.
