 If you liked
Black Lagoon
|
 ...then you might like
Marginal Operation
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Both Marginal Operation and Black Lagoon share a number of story elements, with a "socially awkward" Japanese NEET/Salaryman getting entangled in the exploits of a Mercenary/PMC/Pirate outfit. Black Lagoon is generally lighter in tone, but both series play on the humor of the protagonist not fitting in with his hardened surroundings.