 If you liked
Shi ga Futari wo Wakatsu made
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 ...then you might like
Dendrobates
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The badass with a heart of gold protects/avenges the innocent against criminal scum
Both series has a main male protagonist that also plays the role of an anti-hero. They are very skilled in combat and tactics to get jobs done. At the same time, their persona is represented by a complexity of their personalities.
There is a decent amount of action in both series and I recommend these two titles to anyone who is interested in a story with engaging development.