 If you liked
Shi ga Futari wo Wakatsu made
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 ...then you might like
Zetman
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Mamoru and Jin are similar characters, both come off as rather surly lone wolfs, but they are nice guys beneath their tough exteriors and have soft spots for their friends and allies whom they employ their unique abilities to protect. The art is very clean and clear, and both titles have secret organizations sending assassins with special abilities after the hero and his allies leading to duels where strategy is as important as force.
Shi ga Futari wo Wakatsu Made and Zetman are series that focuses on a dark realm of society. The main male protagonist are mysterious characters with a shady past but they do have a gentle heart when it comes to protecting what they care. Both series adapts supernatural elements so expect concepts out of the ordinary. There is also plot twists and revelations that reaches upon deeper than meets the eye. And finally, both series portrays a similar style of relationship developments with their complex nature.