A century-old wasteland, steel redemption. After the "Apocalypse Day" in 2069, mankind was forced to retreat to the underground city. Facing the tide of alien beasts that devoured everything, mechas became the last barrier for mankind. Zhou Yichen, a teenager from the garbage star, discovered the remains of a mysterious ancient mecha in the ruins. After the onboard intelligence brain "Yuan" awakened, he found that he could resonate with the ancient machine soul. From the underground city arena to the interstellar battlefield, from the wasteland wanderer to the savior of mankind - when the giant beasts from the star sea descend from the sky, and when alien natural disasters sweep across the wasteland, only iron will and an unyielding fighting spirit can write the final epic of the mecha era.