 If you liked
Rokka no Yuusha
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 ...then you might like
Norn9: Norn+Nonet
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-Both are mystery, and they're trying to figure out who the "insider" is.
-Both have a diverse cast of males and females.
-Both have incorporated a fantasy element; the characters have some sort of power.
If you're a fan of mystery and great art (and plot), try these animes.