 If you liked
Banana Fish
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 ...then you might like
Kage no Jitsuryokusha ni Naritakute!
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Both series deal with gruny topics and in a dark but comedic manner. Banana fish is more of a slow burn action with gangs and armies fighting each other over a mysterious 'problem' and EIS is more of an op main character with the large army behind the MC. Both series will try and kick back with witty humor and I found it interesting especially with EIS