Henkei Shoujo: school☆days

In the past, girls played a dark role as living weapons in wars. They were "transforming girls" who could change shape into airplanes, cars, ships, and more! After the war comes to an end, the girls, no longer needed as weapons, hide their identities to live ordinary lives in school. How is the school life of these girls who do not know the left and right of normal civilian life?
(Source: Kadokawa, translated)