Calliostro, a small country with a population of only 3500 in Europe, is the birthplace of goat banknotes, the most realistic counterfeit banknotes in the world. Even big thieves like Lubang III were almost deceived by the authenticity of its counterfeit banknotes. When Lupin and his companions traveled here, they happened to meet a beautiful girl Clarice who was being chased by a gang of thugs. Lupin came to the rescue, but if he realized something from the ring left by the young girl. It turned out that Lupan had come here many years ago to find the whereabouts of the goat banknote and met Clarice, who was a child, and her father, who was an archduke. Now things have changed. A fire destroyed the Archduke's castle seven years ago. Clarice's parents were both killed in the fire. The lonely Clarice was helpless, and count Calliostro, the regent, forced the girl to marry her. Lupin decided to save the girl from the count and explore the secret of the treasure hidden behind the ring.