Researchers unearth a long-lost page of "The Travels of Marco Polo" and discover it's a clue to a lost treasure! Lupin appears to swipe the tablet, but he leaves empty-handed... and as a murder suspect! He shrugs off being framed for the death of an archaeology professor just enough to go treasure-hunting. Tailed by both a weapons dealer and ICPO Inspector Zenigata, Lupin must rely on his gunslinging partner Jigen and the professor's granddaughter Lisa to stay two steps ahead. Meanwhile, the swordsman Goemon rethinks his devotion to the blade and finds romance deep in the mountains. Two tales collide in a worldwide adventure packed with history and laughs!