Origin: Spirits of the Past(2006)

Giniro no Kami no Agito

Long ago, the Forest was awakened and the Moon unleashed a ravenous Beast upon the Earth. Centuries later, as humanity struggle to coexist with the Forest, Agito revives slumbering Toola, who calls forth ancient technology to reshape the future from the ashes of the past. With the blessing of the Forest, Agito must save Toola from herself in order to rescue them all.

(Source: Crunchyroll)