Lupin, a skilled thief, is tasked with retrieving six stolen valuables from his former partner Mark Williams, who has since passed away. According to Mark's dying wish, Lupin must return the stolen items to their original locations, and only then will he be able to discover the location of the elusive Trick Diamond.

Rupan sansei: Otakara henkyaku dai-sakusen!!
A cunning thief is tasked with retrieving six precious treasures and returning them to their rightful owners, with a lucrative reward awaiting their successful completion of the mission.