Taking place between the events of Guilty Gear Xrd and Guilty Gear Strive, Ky Kiske and Dizzy are soon to be married. But not all approve of the joining of human and Gear. Old wounds remain from the cataclysmic war between humanity and its creations that nearly ended the world. When a mysterious girl with a hatred for Gears declares war against the Gears and any who would aid them, Sin Kiske and Sol Badguy must go on an adventure to stop her.