In this thrilling episode following Urotsukidoji III, the survivors of the Azuma kingdom genocide embark on a journey aboard a futuristic tank with Osaka as their destination. Determined to confront the powerful Overfiend and face their own destinies, they come across a civilization beyond imagination, ruled by cruel children. Amano Jyaku takes on the heroic role of saving his friends from the clutches of the evil ruler, Ellis. Meanwhile, Sui Kaka Ju’s sister, Yoenhime, summons Munhihausen, who transforms her into the vengeful Yoenki, seeking retribution for her brother’s death at Amano’s hands. However, Munhihausen has his own secretive motives. The ultimate climax of the Urotsukidoji legend unfolds in Osaka, where Kiojo, the innocent Himi, and the Chojin finally confront each other face to face.