 If you liked
Weiß Kreuz
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 ...then you might like
Tokyo Majin Gakuen Kenpuchou: Tou Dai Ni Maku
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More specifically, if you were intrigued by the concept of the Twelve Heavenly Generals in the Martial Fist arc, then you may enjoy the similar group, Weiβ. Both are underground assassin teams that target criminals who escaped the justice of civil law. There's also the same angst-ridden back stories to some of the characters.
And if the supernatural element of "Tokyo Majin" excites you, then check out the antagonist group to Weiβ (White), Schwarz (Black) whose members have ESP powers and work in the shadows.