Summary:

In the last surviving underground polis Dunwich, only the darkness and earthquakes dominated. God never again responded to the prayer of his devout believers. The church started implicating all citizens in polis with a hysterical ritual called Purification, attempting to regain God's favor. Easton, the protagonist, after witnessing his father executed by clergmen in Purification ritual, was determined to seek God's kingdom of heaven Eden on his own. During his journey beyond the underground world, he recovered myths and contradictions in the creation story preached by the church, unveiling the truth of Eden.