After receiving a mysterious invitation, Inspector Zenigata arrives in San Marino for Lupin's wedding to Rebecca Rossellini, a wealthy heiress and businesswoman. It's soon revealed that the marriage is a sham, and that Lupin plans to steal the Royal Crown of Liberty, a rare artifact given to women to wear on the day after their wedding. Zenigata unravels the plan after someone claiming to be Lupin sends him a message, and begins chasing the criminals...