 If you liked
Karakuri Zoushi Ayatsuri Sakon
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 ...then you might like
Top Secret: The Revelation
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Both animes contain a series of detective mysteries the characters have to solve. In Himitsu it is done through looking into a dead person's brain, in Ayatsuri Sakon the mysteries are solved by a young puppet-master using his doll for it. Both animes explore the dark corners of human souls.