As a chief operative of the villainous Kisaragi Corporation, Sentouin Roku-gou receives orders to help the organization conquer the entire known universe. Tasked with infiltrating the kingdom of Grace—a mission that could change the fate of the world—Roku-gou mistakenly believes that his skills as a combatant are superb, fuelling his arrogant attitude. To ensure the success of the mission, Alice Kisaragi, an exceptional android with a youthful appearance named after the company itself, is assigned to be Roku-gou's travel companion.