Lupin III: Chi no Kokuin - Eien no Mermaid

Also known as:  Lupin Sansei: Chi no Kokuin - Eien no Mermaid, Lupin III: Blood Seal - Eternal Mermaid

Lupin III: Chi no Kokuin - Eien no Mermaid (Blood Seal - Eternal Mermaid) is the 21st TV special starring the crafty thief character from Monkey Punch's caper manga, and follows more than a year and a half after the 2010 TV special Lupin III: The Last Job.

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Producers, official website and other details: AniDB, ANN, Wiki