So... Darker Than Black?
I hated the second series where what's his nuts became a bum, like actually a bum...plus that little loli faggot girl was riding his dick and pulling magical sniper rifles from her chest....Fuck that whole series. Oh and the follow up where they turned the doll into some type of pseudo waifu pedo fetish loli character...seriously, that show dropped the fuck off.
First series is phenomenal obviously, a bit jarring at times but it was paced correctly. I'll always love the inspectors (or whoever she was O'hara I think, it's been YEARS since I've seen it) glasses. Those damn glasses were kick ass.