Three years after the Metal Fetishist's nightmarish transformation in Tetsuo (1989), the ordinary salaryman, Taniguchi Tomoo, sees his world crumble when fanatic metal-worshipping skinheads abduct his only son. Forced to unleash his dormant destructive power, Tomoo will finally embrace the cathartic effect of the ultimate metamorphosis, as his naked rage transforms the once-feeble flesh into a grisly symbiosis of hard metal and soft tissue. Who dares to stand in the way of the ultimate body-hammer?