Tokyo in the Near Future.
People began to live in the sky to avoid disasters and pestilence.
NOUNAI Senri joins the big pharmaceutical company RUOWA to cure his sister Mari's incurable disease. There, he takes RUOWA Metal, a drug that turns muscle into metal, and the side effects weaken his body.
Senri tries to disclose the side effects to the public, and is captured by the department head along with TAKAYAMA's daughter Ellie, who is the last survivor of the side effects of RUOWA Metal.
Senri falls down defending Ellie.