Eleven-year-old Masaru Saiga inherited a vast fortune after his father died in an accident. These riches make Masaru a target for kidnappers, who send fearsome puppets to abduct him. Masaru escapes with the help of circus employee Narumi Kato, but the kidnappers soon catch up with them. All seems lost until a mysterious woman named Shirogane appears.
After the briefest of respites, Masaru, Narumi and Shirogane are plunged into peril once more. Assassin Eiryo Ashihana has tracked them down and attacks with the evil clown-like marionette Pulcinella. Shirogane unleashes her own marionette Arlequin in response, but while she is distracted, Ashihana’s henchmen seize Masaru.