Lupin and Fujiko are enjoying a nice day together. Fujiko asks Lupin to steal an expensive painting. Learning Fujiko is the reward, Lupin jumps at the job. After Lupin runs off with the painting, he learns its a fake and finds himself in a bind when he learns Fujiko double crossed him and is working for the owner of the painting. After finding out the man once conned him years before, Lupin begins to wonder what this man plans to do. Lupin's suspicions get the best of him, and after a couple of failed attempts, he breaks into the man's house. What does this man wish to do, and what is Fujiko up to?

While trying to enjoy a simple Japanese meal, Goemon has been arrested and thrown into prison! This is all part of a scheme to use Goemon as leverage against Lupin. An arm to a mermaid statue is in the wreckage of the Santa Maria; if Lupin can retrieve it, Goemon will be freed as payment for Lupin's services. Can Lupin outwit everyone and resist the amorous advances of a dolphin?

Lupin has his eyes set on a jewel heist, but he finds his hands a bit full. Some children are claiming that he is their father! Jigen and Goemon scoff at Lupin's impropriety until they find themselves in the same mess. Can the gang juggle their jobs and fatherhood?

The key to an unbreakable safe is hidden in a near impregnable prison. With a bit of help, Lupin makes off with the key, but crime boss Carlos makes off with the safe. As the two sides square off, can any of them remember the old saying about honor among thieves?