In the distant future, the discovery of the new mineral Orichalt (オリハルト? Oriharuto) has allowed humanity to expand beyond the Sol System. On the constant lookout for Orichalt, humanity has developed I-Machines (Iマシン? I mashin), robots that operate in extreme environments. I-Machines function by transferring a human pilot’s consciousness into the robot’s operating system; in that sense, the human becomes the machine. While Alliance Academy student Maya Mikuri is in the middle of operating an I-Machine, she gets involved in an incident with pirates, and ends up serving as a crew member on an excavation company’s spaceship.