With the rapid development of robotic hyper   technology, a new category of humanoid-type machines called Labor has become   widely applied in every industry field. However, Labor diffusion has created a   new threat to social stability, as the same technology is increasingly being   used for criminal purposes. In order to fight the so-called labor crime, the   Tokyo Metropolitan Police Department has formed the Special Vehicle Unit,   equipped with Labors designed to keep the public order. These patrol labors are   commonly known as Patlabor. The year is 1999. Japan has concentrated 45% of its   entire labor force in the ambitious Babylon Project, designed to save the Tokyo   Bay area from being submerged as an effect of the sea level increment. For this   purpose, a 500-meter wide and 150-meter high multy-level platform, called the   Ark, has been built on the sea. The suicide of a mysterious man on the massive   Babylon Project construction site sets off a cascade of events that may signal   the eventual destruction of Tokyo. What is the connection between the suicide,   the new Mobile Police AV-X0 Zero Labor, and a military prototype Labor suddenly   gone berserk?