Arrested for the massacre of mysterious cultists, the mysterious An is brought into custody to unravel the events that led to it. Hired as a Night Watchman, An started out roaming the halls of an abandoned hospital, supervising the squatters that lived there. But he soon discovers that the squatters are victims of a cult who abuse their social status to kidnap children for their ritualistic purposes. Guided by the spirit of Santa Maria, he attempts to stop the cultists but is soon overwhelmed and left for dead.

But An is not ready to give up yet, he strikes a deal with a Death God known as Hanuman where he is given unlimited power and abilities in exchange for a piece of his soul. How far in the darkness will he go, in order to save the children from the Four Horsemen.