A girl named Nina, who became a wanderer due to the war, is caught trying to steal food from a wedding venue one day. Prepared to be turned over to the police, Nina is instead pardoned by a group of girls who arrive with a magical battle tank. These girls are members of a private tank squad known as the Headless Rabbits, dedicated to protecting the city from the calamity of rogue tanks born from the war. Just then, a siren sounds, signaling an attack by a rogue tank. Nina, who once rode in a tank, finds herself in a situation where the Rabbits are without a gunner. Dorothy, the tank commander of the Rabbits, declares to her members, "We just found a new gunner!" This is the proud debut of the winner of the 9th SD Novel Newcomer Award!