The main character is Aris, a young aristocrat who has been relegated to the lower layer, which gives him a strong desire to return to the upper layer.
After he says goodbye to Bryant, his boss, he meets Deacon, his best friend for years and a prisoner on death row. They are suddenly attacked by a resurrected corpse. When Aris wakes up, the resurrected corpse Caeran actually becomes his co-worker.