Lupin has invited all of his friends to a villa on a private island. It is the first time they have seen each other for the past five years. Lupin is planning a big surprise while they are all at the villa except Fujiko, Goemon and Jigen find Lupin's behavior to be unusual. They are also curious about who the man in the iron mask is who is chained up to a wall for the reasons they are about to find out.

Source: ANN

Note: An original animation part of the Lupin 40th Anniversary Master File Blu-ray set, released on March 28, 2012. It received an early screening together with three episodes of the original TV series at Toho Cinemas Roppongi Hills on Sunday, March 18, 2012.

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Parent story: Lupin Sansei: Part III
Other: Lupin Hassei