Tokyo in the near future.
In order to cure his older sister Mari's incurable disease, NOUNAI Senri joins the large pharmaceutical company RUOWA, but after taking the RUOWA Metal pill, which turns his muscles into metal, he finds that the side effects are weakening his body.
The body of TAKAYAMA Eiki, the last user of the drug, was donated, and he was able to survive. However, six months have passed since he quit RUOWA and was kicked out of his parents' house.