Black Lagoon: Roberta's Blood Trail [OVA]

The assassination of the head of the Lovelace family in Venezuela sets his maid, a former terrorist named Roberta, on a bloodthirsty quest for revenge at any cost. The search for the culprits leads her to Roanapur, causing a massive commotion in Thailand. Garcia, heir of the Lovelace legacy and someone who regards Roberta as a precious family member, also travels to Roanapur and wants to make a deal with the Lagoon Company.