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Anthony, an average American working in Tokyo, is a salaryman who married a Japanese woman named Yuri. Their son, Tom, is three years old. The small family of three lives very happily. One day, their beloved son is suddenly murdered by a mysterious man. Anthony, plunged into despair, begins to investigate the truth behind the incident. He discovers that his son's tragedy is related to his own father. Anthony's father was an anatomist who once worked on a secret research project. In his anger, Anthony goes against his father's teachings and loses himself. His body starts to become metallic, emitting steam and black oil, transforming him into a steel weapon.