Knight of Erin Episode 4, "An Orgy of Maids and The Final Enemy," concludes the adult fantasy OVA series as mercenary Erin faces a final boss to restore Nighthawk's magical powers. Produced by Majin, this final 16-minute episode focuses on the duo overcoming their toughest challenge in a mysterious Western-style mansion. For more details, visit MyAnimeList.net . Knight of Erin (OVA 2020)