Black Lagoon is a Manga in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.blacklagoonmangafree.com fastest updating comic site. The Summary is

Rokuro Okajima is just an average Japanese salaryman, living an average life. But when he’s taken hostage by the crew of the Black Lagoon, Rokuro finds himself thrown headfirst into a deadly world of outlawed heroes, brutal villains, and blazing gunfights. Where he ends up is anyone’s guess, but one thing is for certain—he’s in for a wild ride!