 If you liked
Tantei Gakuen Q
|
 ...then you might like
Kindaichi Shounen no Jikenbo
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These are really fun and amazing detective shows both are somewhat old but it has more originality. Kindaichi Shounen no Jikenbo has serial killers which is personally fun to me and Tantei Gakuen Q is a bit more like a game. These two didn't seem as predictable as other detective shows.