Seventeen-year-old former aristocratic girl Ivia Lorraine was exiled to the permanently frozen industrial city of Anvil Castle in the north because her family was wronged and treasonous, and became a mine cleaner. In despair, she accidentally obtained the brass gear left by her father. This mysterious token not only projected the erased fragments of civilization, but also revealed the shocking lie of the empire's "three hundred years of glorious evolution." In order to explore the truth, Aviya teamed up with the mechanical genius Lake to escape the pursuit of the Royal Chamber of Secrets and drove the "Mole" steam locomotive through underground tunnels. On the way, they met Lina and Sylph, the descendants of the clockkeepers, and unlocked the secret of the ruins of the ancestors - the empire concealed the ancient civilization where spiritual elements and steam coexisted, and the original deception was hidden under the eternal furnace. Holding the fragments of the key of memory and shouldering the blood mission of the Lorraine family, the four of them traveled through the ice field, cracked the trap, fought against the pursuers, and gradually pieced together the sealed history. When the fragments of the meteorite resonate with the ruins, Aviya will eventually face the ultimate choice: to maintain the peace built by lies, or to return the forgotten truth to the world at the cost of blood.
