Two filmmakers have to deal with a rogue mascot.

Nanami Hoshino, a wealthy entrepreneur, marries potter Kim Jun-ho, and they both live a seemingly happy life until Nanami is killed by a biker on her way home. Now a ghost whose presence cannot be seen, she realizes that her death was no coincidence and seeks help from the elderly psychic Unten in hopes of saving Jun-ho's life.

Following a lead from Fujiko, Lupin and Jigen excavate the sea floor in Kiritappu to search for a lost underwater treasure that supposedly holds the secrets of time travel. After the Lupin gang escapes a run-in with the law, a strange man calling himself Kyousuke Mamoh strands the Lupin gang hundreds of years in the past.