A girl named Nina, who became a wanderer due to the war. She is caught trying to steal but is forgiven by the girls who appear alongside a magical tank. These girls are members of the private tank squad, Rabbits, who protect the city from the rampaging magical weapon, stray tanks. At that moment, a siren sounds, signaling an attack from the stray tanks. Once a tank operator, Nina now finds herself in a Rabbits squad without a gunner. Dorothy, the tank commander of Rabbits, declares that they will welcome Nina into their ranks and sets off to the battlefield!