Chiko, who had been leading a lonely life because of her parents death. Together with the Phantom Thief Nijuu-Mensou (20-Faces), she sets out on a journey into the real world. She gradually changes as she encounters new friends and places. But strange events start happening revolving around the mystery of "Legacy of the 20-Faces". So Chiko has to move forward, regardless on how checkered her life will become.