Aoba is a young girl who enjoys building robot models. She lived alone with her grandmother until the latter passed away. Shortly thereafter, Aoba is kidnapped and taken to a secret base, where she discovers a massive robot. Piloted robots battle the Ancient-Jinki in The Grand Savanna, yet the true purpose of these conflicts remains concealed. Aoba labors diligently at the base, hoping that one day she will be able to pilot one of the robots and uncover these secrets.