Lupin attempts to steal a royal crown from the fictional country of Vespania after its owner, the queen, is assassinated by her son, who then shot himself. Jigen infiltrates the National Guard as a sharpshooting instructor, while Fujiko tails the princess, on holiday in Japan. Meanwhile, Conan Edogawa saves the princess, who looks exactly like his friend Ran, from an assassination attempt. Inspector Zenigata teams up with Kogoro Mouri to catch the assassin and foil Lupin's scheme. Fujiko kidnaps the princes