ReMember

A man named Zaji finds himself in a ruined Japanese city after the country has lost the war to the United States. Suffering from amnesia, he recalls only the need to remember something vital. Despite his lack of memory, he possesses advanced martial arts abilities, which he uses instinctively. He is sheltered by Gin, who runs a bar frequented by American soldiers. As he attempts to safeguard vulnerable people in a broken society, Zaji gradually discovers the full range of his capabilities.