Lupin brings his old friends together at a villa on a private island, and it is the first time in five years that the group has been in the same place. He is preparing a big surprise for them during the stay. Fujiko, Goemon and Jigen, though, sense that something about Lupin is off. They also want to know who the man in the iron mask chained to a wall is, and why he is being held there. This one-episode comedy adventure special was made for the Lupin 40th anniversary Blu-ray set.