Tokyo Majin Gakuen Kenpuuchou: Tou Dai Ni Maku

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. 

Dejá vu would explain this recommendation pretty well. Same motivations, same style, same genre... Similar character designs, similar plot, similar situations... Even the "WTF?! This can't be the freaking end!!!" feeling from both shows is the same here (aka. the ending is terrible / non existent). In other words, if you liked one it is IMPOSSIBLE to not like the other. The only thing that differentiates them is basically the fact that this is a bit more violent and a bit less ecchi and the pace is a bit different (this one is way faster), but everything else is near a carbon copy. 

Similar art work,similar happenings and similar way of story telling.