 If you liked
Clamp Gakuen Tanteidan
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 ...then you might like
Meitantei Conan
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The fact that both these series are detective series is a reason why you should read this after that. But not really. Although both have several similar genre's, Detective Conan deals with mature and eerie cases, while Clamp School Detectives .. are School detectives. The levels of both series are a huge difference, tho', some cases might look (or are) almost the same.