JINKI: Shinsetsu

The prequel to JINKI: Extend, which basically tells the story of a 14-year old, robot modelling girl named Tsuzaki Aoba. She encounters a giant JINKI robot type, called the Moribito-2, and ends up fighting against ancient JINKI and an unknown force.

Akao Hiiragi lives in Japan, and she has lost her entire memory except for three years ago. But one day she meets a mysterious man named Ryohei who tells her that she is a "cognate"; a person with special powers that enable them to pilot robots called Jinki. All across the world, a mysterious phenomenon is occurring, known as the "Lost Life Phenomenon", where an entire town is destroyed from a series of mysterious nuclear-like explosions. Akao discovers that this is not a natural phenomenon, and that it is being caused by a mysterious and evil group called the Hachi Shojin, who are also cognates, and pilot their own Jinkis. Even though she hates to fight, Akao must pilot a Jinki to protect the ones she loves. (Source: Anime News Network)