 If you liked
Spiral: Suiri no Kizuna
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 ...then you might like
Tantei Gakuen Q
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They are both detective anime, but the mysteries in detective academy Q are more solvable and intriguing whereas the problems in spiral are more on the unreasonably difficult side.
Spiral and Tantei Gauken Q both deal with mystery sindicates that they are out to stop. There is also a rather dark mood to both shows, though Spiral is probabbly the darkest of the two.
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Recommended by Yemi_Hikari
lot's of mysteries, although Spiral is definitely darker one, and more dangerous for participants... Still, breathtaking mysteries, and danger, and also tricks, you can find it in both, though Tantei is by far more cheerful.
If you're keen on checking out some detective fiction, then these two series should definitely be considered.
Both series features the theme of mystery and thus involves detectives. The main characters plays the role of the detectives in this case.
Both series takes place at a school life setting although some of the cases involves stepping out of the field.
Both series' main female protagonist has similar personalities in that they are curious but also intelligent and helpful girls who wants to be useful to the cases.
Both series has drama, comedy, mystery, and action occasionally when the needs arises.