In the year 597 of the New Era, the world after the abyss mutation was shrouded in pollution and alien species. The young boy Qi Xia discovered that his shadow could reflect the mysterious scenes of the dark side world. Those bloody flesh balls and twisted tentacles that were once regarded as hallucinations actually came to Shanhai Base City in real life. When a bloody light group appeared in the shadow of the ophthalmology clinic, and when the mysterious "Old Dusk" contract pattern was suddenly imprinted on his chest, he was shocked to realize that he was not a patient - but a "shadow contractor" who could resonate with the cracks of the abyss.
