"Warning! The 'Leviathan'-level behemoth has broken through the third line of defense!" The behemoth is rampant and civilization collapses. Humanity can only huddle in the giant steel city and rely on the giant mecha called "Titan" to survive. Jiang Chen is a scavenger at the lowest level outside the ruined city. His dream is to be able to drive a real Titan once, instead of working with scrap metal every day. Everyone laughed at his whims.
