 If you liked
Darker than Black: Kuro no Keiyakusha
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 ...then you might like
Kage no Jitsuryokusha ni Naritakute!
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Both series feature a secretive underground organization with the main character using a group of skilled fighters to complete dangerous missions. They share dark action fantasy themes and a substantial degree of gore and violence. "Darker than Black" has a more noir-like atmosphere and focuses on espionage and supernatural abilities, providing a different but equally gritty and unforgiving environment compared to "The Eminence in Shadow."