Young Japanese business drone Rokuro Okajima was given a simple, but important task by his company: carry a critical CD on a business trip to South East Asia. His mundane, metropolitan world gets turned upside down when a team of modern-day pirates called Black Lagoon not only steal the disk but kidnap him for ransom as well. When his employer decides that preventing the disk from falling into the wrong hands is more important than saving him, Rokuro finds himself thrown into the harrowing world of Black Lagoon, a world utterly unlike the one he knew before. He ultimately joins leader Dutch, mechanic Benny, and the spitfire combat specialist “Two-Hand” Revy as a permanent crew member while helping out on assorted missions and incidents of peril, including dealing with enemy gunships and gunboats and investigating the wreck of a sunken Nazi submarine that a group of Neo-Nazis also seeks.
