Roberta, the terrorist-turned-maid who initially appeared in Black Lagoon's first season, returns in this five-episode OVA series—and this time, all bets are out! During a political event, Roberta's benefactor, the patriarch of the Lovelace clan, is assassinated. The assassin's trail quickly leads back to Roanapur, therefore she's returned on a revenge mission! However, the new patriarch, Garcia, and Roberta's apprentice (and maid), Fabiola Iglesias, are close behind her. As the toll of Roberta's deadly rampage rises, forces from inside the corrupt island (including the Lagoon Company) and from without converge on what threatens to devolve into all-out war!