Plot
An aquamarine gemstone, the Mermaid's Scale, appears in a secret, underground auction. Lupin is coerced by the gem's owner to steal it. He quickly discovers that the stone is a forgery and the real Mermaid's Scale is part of an unsolved riddle that leads to transcending mortality.
Where to watch Lupin the Third: Blood Seal of the Eternal Mermaid?
Lupin the Third: Blood Seal of the Eternal Mermaid is an action movie featuring Daisuke Namikawa and directed by Teiichi Takiguchi.
Lupin the Third: Blood Seal of the Eternal Mermaid is currently streaming for free (ad-supported) on Tubi TV.
It is also possible to buy Lupin the Third: Blood Seal of the Eternal Mermaid on Amazon Video.