Source taken from Wikipedia.org
Black Lagoon (Burakku Ragūn?) is a manga series written and illustrated by Rei Hiroe, and published in Shogakukan's Sunday GX since 2002. An animated television series based on the manga aired in Japan from April 8, 2006 to June 24, 2006, totaling twelve episodes. A second season, subtitled "The Second Barrage", ran for twelve weeks starting on October 2, 2006. A third season was announced on the cover of the first volume of the novel adaptation.
Okajima Rokuro is a Japanese businessman…in a town full of Japanese businessmen. His normal day consists of social drinking with clients and being kicked around by his bosses. He finally gets a break though, as he’s sent by his company to the tropical seas of Eastern China to deliver a disc only his boat gets hijacked by a band of mercenaries that were hired to steal it.