The year is 1999 A.D., or Showa 74, and the world is in a state of upheaval. Dilapidated buildings and crime plague the streets, along with a new invention called Sex Machines - mechanical creatures that can operate as motorcycles once fueled by sexual energy. Although Sex Machines have been in circulation for some time, they have become a popular tool for criminals, leading even the police to adopt them. Suzuka Yoshimura, a fresh-faced officer who isn't afraid to bend the rules, is partnered with her own Sex Machine, named "Ace". Recently, she heard about an exhibit showcasing a "Legendary Sex Machine". What is this contraption, and what is its purpose?
