Nagaishi is the trusted friend and confidant to the three sisters at the heart of Cat's Eye. He's also close with Heinz and his wife. While his exact background remains unclear—though fans have speculated he might've had a military background given his expertise—Nagaishi's main role is practical: he feeds the sisters detailed intel on their heists and hooks them up with specialized equipment and hardware they can't get from Ai. Basically, he's their guy for anything technical or logistical.
Content compiled by AnimeList.moe from publicly available sources.
