 If you liked
Spiral: Suiri no Kizuna
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 ...then you might like
Higashi no Eden
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Both anime are mysteries. For main character Takizawa, in Eden of the East, it is the "Selecao" and for main character Narumi, in Spiral ~ Lines of Reasoning, it is the "Blade Children". Takizawa and Narumi are alike, each with a "devil may care" persona. They also share a style of humor that is very sarcastic and dry. Both come off as cool, confident and nonchallant, and withhold pertinent details from companions while resolving mysteries that will, I assume, inevitably lead them to their goal.