Survivors of a tragic shipping collision are rescued by a mysterious black ship which appears out of the fog. Little do they realise that the ship is actually a Nazi torture ship which has sailed the seas for years, luring unsuspecting sailors aboard and killing them off one by one.
A sinister force permeating a secluded mountain estate convinces the nurse/companion of rock star Parker Stevenson, who has had a nervous collapse, that the house is alive and determined to keep her prisoner.
A group of revived beast-themed Riders gather to form the "Beast Rider Squad"... and Kamen Rider Ouja, the worst villain Rider, is leading them! Can Kamen Rider Brave hunt them with his new Gashat, "Knight of Safari"? And what is the secret behind this battle?