Origin: Spirits of the Past

Origin: Spirits of the Past, known in Japan as Silver-Haired Agito (銀色の髪のアギト, Gin'iro no Kami no Agito), is a 2006 Japanese animated science fiction film directed by Keiichi Sugiyama, written by Nana Shiina and Naoko Kakimoto, and produced by Gonzo. It premiered in Japan on January 7, 2006, and premiered in the United States on September 24, 2006 at the Fantastic Fest film festival in Austin, Texas.

Plot
A failed DNA experiment with plants has changed the world forever, destroying most of humanity, the moon demolished, and all of the aggresive plant-life has gained intelligence spread all of the earth. The few humans that remain struggle to survive, while maintaining an uneasy truce with the restless forest. One day, a villager named Agito stumbles across a stasis unit hidden deep in the forest and awakens a very cute girl from the past. Having slept for the past 300 years, Tula steps into a very different and strange world. The neighboring high-tech village of Ragna is still locked in a bitter war with the forest and when they become aware of Tula, they realize that she is the key to activating her father's final and ultimate weapon of humanity—a weapon designed to totally destroy the forest. When Tula is taken by the warriors of Ragna, Agito makes a pact with the forest to gain the strength and incredible powers to not only save her, but to stop the weapon from destroying both the forest and his village.