NOUNAI Senri's sister Mari has an incurable disease and cannot walk. In an attempt to cure his own sister, he joins the big pharmaceutical company RUOWA, where he encounters an oral drug that turns muscles into metal and causes him to suffer from side effects. NOUNAI Senri gets a job killing people suffering from the same side effects. he goes to Mari who was absent from their brother's wedding, but Mari is crying in her room and says she wants to die soon.