(I'm writing this one to get a feel for it.)
The bustling city by day is home to countless people. On the other side of its mirror image lies a realm of ghosts, shrouded in mist. Like the world above and below the water's surface, the two realms mark the boundary between life and death. To the unknown beings in that ghostly domain, human souls and flesh are the most delectable delicacies. For ages, people with extraordinary spiritual powers have fought the monsters in the mist, preserving the world's prosperity.
Higue, who transmigrated here, will gradually explore the depths of the mist in this perilous world...