A pair of twin brothers were ordered by the grim reaper to serve him on a mission. They were tasked with eliminating evil spirits and guiding lost spirits to cross over. One day, they were asked to take down a black spirit in a school. But then, they sniffed out an irregularity. The real secret is revealed and they realize the spirits they are fighting are the spirits of the victims of a demon cult. Their enemy is actually disguised as an innocent little boy.