In "Nijuu-Mensou no Musume" is about a young girl named Chiko, who lost their parents and therefore now leads a solitary life - until now, one day she decides to "Phantom Thief Niju Menso" (20 faces) to make a journey into the real world.
They met newer people and places that they change gradually. However, during their journey take strange events surrounding the mystery of "Legacy of the 20-Faces" take its course.