In the near-future of 1999, Japan has developed giant robot suits, dubbed "Labors", which they have employed in various contexts both military and civilian. In the midst of a massive Tokyo land redevelopment program called the Babylon Project, Labors begin moving on their own, sometimes against their pilots' inputs, and sometimes without even any pilot present. The motley crew of TMP Special Vehicles Section 2 Division 2 must investigate and stop this phenomenon threatening the project and the entire country.