A thousand years ago, pieces of a meteorite carrying enormous energy crashed down in several places around the world. People called them fragments of God, and humanity went to war to claim them. In one city, the lord gave his life resisting an evil force so that the residents would be protected. Once the fighting ended, mechanics rebuilt the city and established St. Beroro Academy, a school where mechanics can chase their dreams. Banshou Shounian is an action ONA set in this world.