Tokyo in the near future.
NOUNAI Senri joins the big pharmaceutical company RUOWA to cure his sister's intractable disease, but when he takes RUOWA Metal, a drug that turns muscles into metal, he ends up suffering from side effects. He ends up killing people who suffer from the same side effects.
NOUNAI Senri was saved from death by the body of Takayama Hideki, the last user of the muscle-strengthening drug “RUOWA Metal”. That body was provided by his daughter Ellie.