Arsène Lupin Sansei is the grandson of the master thief Arsène Lupin. With his cohorts Jigen Daisuke and Ishikawa Goemon XIII and his love interest Mine Fujiko, he pulls off the greatest heists of all time while always escaping the grasp of Inspector Zenigata Kouichi.
Source: ANN
Note: Before the first series started, there was Lupin III Pilot film which was about 12 minutes…
Yamashita Takeo
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A group of young boys (plus a token girl and her little brother, the obligatory brat) form a detective club, pooling their talents for brain, brawn, invention, and driving skills to solve crimes in Tokyo. Much to the consternation of police chief Nakamura, they often succeed where the professionals fail.
Source: The Anime Encyclopedia
* Based on children's books by Saitou Atsuo. Re-edited from a 1975 TV series.
When a badly injured mouse staggers off a ship in Tokyo Harbor, he tells the local mice that he has escaped from Devil's Island, where Noroi, the evil white weasel, has crushed the mice with his reign of terror. Tough-guy Gamba rashly promises to help depose Noroi.
Source: The Anime Encyclopedia