Under the mist of the steam giant "New London", cults are growing and ancient gods are whispering.
Alan Grant, a silent member of the Night Watch team, is actually the incarnation of the consciousness of "Cthulhu" sleeping in the deep sea. While fighting as a human being against various crazy sects that worshiped foreign gods, he suppressed the power of his body that could subvert the world, at a heavy price.
Those who became deeply bonded with him include the mysterious loli intelligence agent Lilith, the girl researcher Isabella who is obsessed with analyzing the supernatural, and the steadfast silver flame knight Serafina. They only know that he is extremely powerful, but they do not know that he is the most feared existence in the world.
When the final ritual begins and the minions of the alien gods arrive, Allen must choose between "protecting the human world" and "returning to divinity". The fate of Fog City depends on the heart of chaos in this human body.
