The Babylon Project is a huge redevelopment of Tokyo's districts, which includes the construction of artificial islands in Tokyo Bay. Architects and construction workers can move the overhaul forward more quickly by using "Labors," or robots built specifically for the purpose of conducting work. Captain Kiichi Gotou's Patlabor police team is tasked with investigating the strange scenario after a crucial figure in the Project's inception is found dead after committing himself under suspicious circumstances.