Black Lagoon: Roberta's Blood Trail is a oVA anime that premiered in summer 2010, produced by MADHOUSE.

About the production: the story comes from a manga, there are 5 episodes of about 33 minutes and its current status is "finished".

Its main genres are action, adventure, drama and thriller, with themes such as Guns, Gore, Noir and Revenge.

On AniList, Black Lagoon: Roberta's Blood Trail has an average score of 79%, a very good score, and appears on 67,548 users' lists.

The franchise continues in or follows from: BLACK LAGOON: The Second Barrage.

Roberta, the terrorist-turned-maid that made her appearence in the first season of 'Black Lagoon', returns in this five-episode OVA series - and this time, all bets are off! Roberta's benefactor, the patriarch of the Lovelace clan, is murdered during a political rally. The assassin's trail soon leads back to Roanapur - so now she has returned on a mission of vengeance! However, close behind her is the new patriarch, Garcia, as well as Roberta's apprentice (and maid), Fabiola Iglesias. As the body count of Roberta's bloody rampage mounts, forces from within the corrupt island (which includes the Lagoon Company), as well as overseas converge on what threatens to escalate into all-out war!

Official synopsis from AniList.