Sentouin Roku-gou, a high-ranking member of the Kisaragi Corporation, is tasked to help the organization conquer the entire known universe. Being known for his combat skills, he arrogantly assumes that he can accomplish any mission with ease. For his newest task, Roku-gou is assigned to infiltrate the kingdom of Grace, a mission that could change the fate of the world. To ensure success, he is accompanied by Alice Kisaragi, a youthful-looking android named after the corporation. As they arrive at the outskirts of the kingdom, they meet Snow, the commander of the royal guard. Snow takes them to a sacred artifact, which Roku-gou uses as an opportunity to tamper with the ritual and secure a promotion. As punishment, the princess of the kingdom forces him to become an honorary knight, but this also fulfills part of his mission. With his cover established, Roku-gou must now assist the Kisaragi Corporation in their fight against the Demon Lord's Army, all while conducting evil deeds for his company.