
Sadatsugu Nagaishi
永石 定嗣
Trusted friend and confidant to the three sisters, a very good friend of Heinz and his wife. Nagaishi provides detailed information for Cat's Eye's heists and also helps them acquire any hardware and/or other sophisticated equipment that they may need that Ai cannot provide. His background is a mystery but he may have been a member of the Armed Forces as he has some military expertise.
(Source: Wikipedia)
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Cat's Eye
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Lupin III vs. Cat's Eye
Supporting

Ooki, Tamio
Japanese
Hilling, Laurent
French
Mugihito
Japanese
Fagnon, Xavier
French
De ambrosis, Massimo
Italian