Rock is stubbornly optimistic about the world and its people despite Revy's dark and bitter cynicism, and the two start to rub off on each other in surprising ways. He sometimes acts as the Black Lagoon gang's secret weapon, since no one expects such a meek and well-dressed fellow to wield an RPG or drive a getaway car. Rock uses his business acumen and calculating mind to help support Dutch and Benny as the brains of the outfit. His new allies, including the fierce tsundere Revy, the easygoing Benny and the tough-but-fair Dutch, are all that stand between him and a bullet between the eyes. He crosses paths with the Black Lagoon mercenary gang during a fierce battle and soon joins as their newest member. Rock has hardly ever shot a gun or smuggled anything in his life, but now crime and violence are a daily reality so he must adjust quickly - or face his doom. Rock's life is turned upside down when his company betrays him, and he's left to die in the crime-ridden southeast Asian seas. Black Lagoon begins with Rokuro 'Rock' Okajima, a businessman who generally narrates the story and, in the anime version, serves as the protagonist.

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