 If you liked
Black Lagoon: The Second Barrage
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 ...then you might like
Raise wa Tanin ga Ii
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Both anime have badass female protagonists that are involved in the world of organized crime, Revy in Black Lagoon and Yoshino in Raise wa. Yoshino is the granddaughter of a yakuza boss similar to Yukio Washimine from Black Lagoon: The Second Barrage who is the daughter of a yakuza boss while Revy is a gun for hire that many times works for the mafia. Both Black Lagoon and Raise wa have strong but crazy, mentally unstable characters, in Black Lagoon those type of characters are mostly the women while in Raise wa those types are mostly the men.