Aoba is a young girl who loves to build models of robots. She lived alone with her grandmother until her grandmother passes away. Shortly after she is kidnapped and brought to a secret base where she discovers a huge robot. The piloted robots fight against Ancient-Jinki in The Grand Savanna, but the true meaning behind the fights is hidden. Aoba works hard at the base so one day she can pilot one of the robots and discover these secrets.

女主角津旗青叶是个美丽开朗的女孩,某一天突然被神秘人士绑架,被带到了南美洲委内瑞拉的一个叫做安海尔的组织里,在那里她被迫成为了一种叫做人机的巨型 作战兵器的驾驶员,而她的好友黄板伊露也被卷入了这次的事件之中而成了二号机器的驾驶员。她们的敌人是一个叫做 虚无 的组织,这些人用人机来攻击各个国家,海拉尔于是在世界各地寻找能够驾驶人机的驾驶员与之对抗,失去了记忆的少女冬赤绪是解决问题的关键,各个美少女在与 黑将军的不断战斗中,赤绪的记忆逐渐恢复,成了对抗虚的主要力量。