Armour Jacket (アーマージャケット Āmā Jaketto) is a Barrier Jacket-like defensive costume worn by Isis Egret. Although it looks like the Barrier Jackets, it is generated differently from fuel batteries. It cannot be confirmed if it is a defensive spell like Barrier Jacket or a Device-like equipment like Shell Coat. Although Isis calls "Armour Jacket, on!" to set up it and Perfume Grab, it is generated by the secret fuel-battery unit (while the Perfume Grab is driven by that unit). This is similar to a mage using mana to form the Barrier Jacket, so it is tentatively classified as a defensive spell. In addition, no standby form is shown before the setup.