a 16 years old girl named Maron Kusakabe. Who is actually a reincarnation of Saint Jeanne d'Arc. Her mission is to fight demons who steal valuable objects and possess their owners before the arrival of the new century. She is assisted by a small Finn Angel. Jeanne is considered by the police that she is an ordinary thief. A special team of dedectives is set up to catch her, hosted by her best friend's dad, Miyako Todaiji.
