In 2047, the nuclear winter of World War III has not yet dissipated, and a nanomachine plague called "Gray Tide" has pushed human civilization into the abyss. The survivors huddled in underground shelters, lingering on the ruins of the old world. The former glory of science and technology has been reduced to legend, and the most chilling name in the legend is the "Return to Ruins Project" - an ultimate weapons plan that was deliberately erased from historical archives and is said to be able to reverse the situation of the war.
Ye Cheng, a low-level maintenance worker in Vault No. 12, Accidentally fell into the underground abyss and discovered the "Iron Skeleton" of a giant mecha that had been dormant for thirty years. Hidden in this cold and silent mechanical body is not only the terrifying force that can tear apart the wasteland, but also a truth that is desperately buried by all those in power: the end of human civilization is never a natural disaster, but a man-made disaster.
When Iron Skull's fusion core rekindled blue light, the balance of power in the wasteland began to tilt. What Ye Cheng didn't know was that waking up the machine itself was a one-way ticket to hell. And those existences that have been peeping in the darkness for a long time are waiting for him to walk over step by step.
——"What you hear is never the heartbeat, but the countdown to war.
