Sergo is an assault robot, the only android in the Bridgeburner Squadron, an elite corps of the Alliance immersed in a difficult mission in the midst of World War III. He was prepared for battle, he was prepared to resist large-caliber bullets, he was prepared to face the most extreme situations… but he wasn’t prepared for Cat. A story of friendship in which two very different types of heroes will cross paths and change the rest of their lives. A short, self-contained story; a tale that serves to provide a better understanding of the world and characters of Hearts of Iron.