This is the 300th year after the collapse of civilization, and the world is a rust-colored ruin. Zhuge Qingyun, a craftsman with extraordinary knowledge of the old world, guards an unopenable metal book in his daily life of struggling to survive. Until a ruin hunter named "White Night" brought a reward for a "key", breaking his inherent peace. The pattern of the key had a fatal resonance with the forbidden book in his arms.
This is not only an adventure through wastelands and ruins, but also an exploration into the tombs of civilization and self-memory. When the truth about the "Key" and the origin of the "Forgotten Era" were revealed, Zhuge Qingyun discovered that he was not only responsible for current survival, but also the judgment and decision of the entire past civilization.
