At Loch Ness, Scotland, the mysterious monster Nessie shows itself charmed by Fujiko's singing. Doctor Oz, seeing this, decides to use Fujiko to draw out Nessie so that he can capture it and show it all over the world. Dr. Oz's other motive is to get revenge on the monster for having bit off his leg many years ago. Lupin, Jigen and Goemon seek to help Fujiko and the Loch Ness Monster from Dr. Oz.