In the fictional capital "Teito" where the arictocrats continue to thrive there are rumours about a mysterious thief, who only steals from the rich and aids the poor. People call him K-20 ( The Phantom Thief with 10 faces). Heikichi, a circus acrobat was conned and mistaken as K-20 and subsequently arrested by Detective Akeshi, In the midst of clearing his name, Heikichi rescued Yoko, the Duchess, Detective Akechi's betrothed fiancee. In the non-stop battle with K-20, the true identity of the thief may finally be revealed!