Casshern Sins (anime show)

Description: Casshern, a subordinate of Braiking Boss, was sent to assassinate Luna after she appeared as a savior to the human race. After the assassination, Casshern disappears with his memory lost. Years later, he resurfaces to fight off anti-human robots in a post-apocalyptic Earth where humans and robots are dying due to "The Ruin", an unknown phenomenon which kills off robots by rotting their bodies while forcing humans to survive by hiding.