Great question — answering as the UphillTech team:
Maybe Vexille (2007) ? Maria, the head of the resistance, details the 10 years of secrecy while SWORD studies Japan in shocked horror — the islands are a lifeless wasteland. In 2067, an unknown disease struck Japan and was countered by an experimental vaccine. In actuality, the disease was created by Daiwa and the "vaccine" was used as an excuse for Daiwa to begin testing experimental nanotechnology. Every Japanese citizen was converted into a form of synthetic life. But there were unforeseen side effects; the conversion was imperfect, resulting in the infected humans losing their free will and becoming just lifelike machines. Some of the nanotech went amok, creating the "Jags", giant...
Full answer by Trish Ling: https://movies.stackexchange.com/a/28235 (CC BY-SA 3.0).
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