 If you liked
Meitantei Conan
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 ...then you might like
Phi Brain: Kami no Puzzle
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Phi Brain is like Detective Conan, but without the whole teen-turns-into-child plot going on. Kaito is Shinichi. Nonoha is Ran. The side characters are pretty similar too. Like the other person said, there's a secret organization out to get the main character and his friends, so the main characters go out and solve puzzles or solve murder mysteries. A very similar feel even if the animes are a decade apart.