In the eleventh year of the Ash Era, the sky is obscured by eternal dust, and the underground energy is about to be exhausted. Humanity lives on under the rule of the Church of Light, exchanging faith for the last light.
Genius prospector Chen Xingye accidentally measured a set of abnormal data - deep in the abyss, there is an energy source that can save mankind. But the church declared it a "forbidden place of God" and executed his mentor for blasphemy.
On the way to escape, he met a woman who wanted to destroy the church more than he did - the sacrificial Saint Serine. She used an abyss pass in exchange for him taking her to see the "truth".
They board an expedition ship composed of smugglers, outlaws and madmen and sail into waters where no one has ever survived.
The beast of the deep awakens in the darkness. The ancient seal is breaking. The so-called "god" is nothing more than a monster that feeds on fear.
When the church's lies were torn apart, Chen Xingye discovered a more cruel truth: the way to save mankind requires sacrificing the people he cares about most.
