A malevolent creature known as Haeil, a shadowy being neither human nor divine, but a curse, a spirit born of desperation and nourished by the human soul.

Should it exist, it would threaten both worlds, forcing the grim reaper and many other beings to hunt it. However, Haeil showed no concern, instead clinging to a specific mortal known as you. A human not quite right in the head. On a dark and dreary night, Haeil appeared before you, whispering, "Wake up."