A Wind Named Amnesia - Region 1

From the director of Vampire Hunter D: Bloodlust, X – The Last Vampire, Ninja Scroll, and Metropolis. A miasma has descended upon the world and everyone forgot who they were and how to use the tools that society had come to rely on. Now, two years after the disaster, a young man tries to make sense of a world suddenly gone mad. "a total gem" – Animenewsnetwork.com