Total Recommendations: 1
If you liked
Darker than Black: Kuro no Keiyakusha
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...then you might like
Phantom: Requiem for the Phantom
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Though Darker has a supernatural/scifi premise and Phantom is about brainwashed mafia assassins, both series follow a protagonist of dubious morality embroiled in a violent underworld who becomes motivated by a faint hope of redemption. Both also have a female figure from the protagonist's past who shows up later to oppose him, although Phantom attempts to develop (quite literally) this character type while Darker leaves her origins somewhat ambiguous. And although the assassins of Phantom don't have superpowers, the action sequences and plot points in the series can be almost as implausible. ;)