After a disaster called "Dark Fog", the sun was obscured by thick dust, the world fell into eternal dusk, and the embers of civilization lingered on the wasteland. Scavenger Ling Chen, a young man struggling to survive in Vault No. 7, Accidentally discovered a mysterious metal ball from the old era during a routine search. This device that can emit low light and low hum seems to contain clues to uncover the truth of the doomsday and even find the legendary "Skylight Base". However, this discovery also makes him a target of the Vault's rulers and other forces. In order to protect this slim hope and to find an answer, Ling Chen was forced to embark on an unknown journey across the vast wasteland. He will face ferocious mutant creatures, unpredictable human hearts, and the past obscured by the "dark fog". Under the eternal dusk, can the echo of hope penetrate the dead silence and guide mankind to find a new dawn?
