Black Lagoon: Roberta's Blood Trail(2010 - 2011)

"Roberta", a former terrorist and current maid, a girl who also appeared in the first series of "Black Marsh", plays the main role in this five-part anime series. The master of "Roberta", the head of the "Lovelace" family, is killed in a political demonstration. The murderer's trial was held, but the accused was acquitted. Clues from the killer of our story end up in "Ravanpur". "Roberta" sets out to take revenge. However, the newly elected head of the family, García, and Roberta's apprentice, Fabiola Iglesias (who is also a servant) are also chasing her. Just as "Roberta" makes piles of dead during her bloody revenge, all the people inside the island (which includes the "Black Marsh" group), as well as people living in foreign countries, unite to fight against the threats that intensify this war.