In the near future, a meteor crashes into the North Pole and brings global calamity and beast invasions in an event named “Doomsday”. Humanity extracts “The Crystal from the Other Side” from the meteor, bringing a power source that turns Doomsday into “Utopia”.

Lu has left the orphanage he grew up in to start his new job as a pilot of an “F-Unit,” a robot created to combat the alien beasts that still roam Utopia. As he pilots through the battles, will he find someone he’s looking for…?