Rokuro "Rock" Okajima, a meek businessman, is on a trip to Southeast Asia, when things turn sour for him: Pirates board the ship and take Rock hostage. While under their control, he agrees to join the crew -- known as the Black Lagoon Co. -- which includes merciless and maniacal Revy, Dutch and Benny. Rock becomes responsible for the account management duties and negotiations of a gang that participates in gun-smuggling, drug-trafficking, kidnapping and black-marketing. Black Lagoon's missions often involve gunfights, hand-to-hand combat and nautical battles.